2002-2009 Trailblazer 4.2L 6 Cyl. Headers and Exhaust Products

[StainlessGuy]

http://www.stainlessworks.net/marketing/2002_09_chevy_tb_6cyl_prdct_annc.jpg


New Product announcement in Pdf form here! (http://www.stainlessworks.net/cart/pdf/2002_09_chevy_trailblazer_6cyl.pdf)
Youtube video @ http://www.youtube.com/watch?v=vL-ZW1LAFjk
Our site with products 2002-09 Trailblazer 6cyl. (http://www.stainlessworks.net/cart/index.php?cPath=382_523_536)

[lint]

Has anyone here at trailvoy, bought these yet, and witch ones if so?

[the roadie]

Something tells me the first member to buy these will be posting up about it, especially the performance gains. It was announced less than 24 hours before your post - I'd give it a little bit longer. Maybe 36 or 48 hours? :coffee

[lint]

lol ,,,yea..

[ScarabEpic22]

Awesome!!! Finally a set of headers made by a great shop! Too bad I dont have a few grand lying around or my stock manifold cracks. Once that happens, its getting one of these and a retune!

[Zero]

kinda wierd how they broke up the header into 2 3cyl headers. does this mean people can only run a dual exhaust, or would you just put in a y pipe at the collectors to get it back down to a single exhaust?????

[DZP]

There is an entire write up on the build of this header system and a members vehicle was used as a test vehicle.

http://forums.trailvoy.com/showthread.php?t=58089

[ssmedt]

in the build-up thread there was mention that you guys might offer a cat-back exhaust; i see the second from the bottom is a single outlet exhaust; anything on a cat- back dual exhaust?

[LMMJ]

in the build-up thread there was mention that you guys might offer a cat-back exhaust; i see the second from the bottom is a single outlet exhaust; anything on a cat- back dual exhaust?

the last one on the sales page

Duals (http://www.stainlessworks.net/cart/product_info.php?cPath=382_523_536&products_id=1869&osCsid=0bce37cf9673f760ccf192d0b9eb9c87)

[ssmedt]

the last one on the sales page

Duals (http://www.stainlessworks.net/cart/product_info.php?cPath=382_523_536&products_id=1869&osCsid=0bce37cf9673f760ccf192d0b9eb9c87)

oh ok; i was confused about that one because it listed it as "true duals" and the tubing looks lke you need the headers with the dual outlets; not just from the cat back:undecided

[LMMJ]

Ohh I see that now. Wierd

[BUC NASTY]

Finally...some headers! :woot:

[poom]

I would like to see a pic and c=video of the single side outlet exhaust? Is it a cat back set up? How much does it cost, Don'y know which one it is on the price list.

[LMMJ]

I would like to see a pic and c=video of the single side outlet exhaust? Is it a cat back set up? How much does it cost, Don'y know which one it is on the price list.

single exhaust (http://www.stainlessworks.net/cart/product_info.php?cPath=382_523_536&products_id=1867&osCsid=b081efc15a1b517f3992fe72302c8155)

[06TrailSkillz]

I'd Like to see the acutall HP gains, thats what we need hp gains and comparisons with the different exhaust systems.

[StainlessGuy]

oh ok; i was confused about that one because it listed it as "true duals" and the tubing looks lke you need the headers with the dual outlets; not just from the cat back:undecided

We updated the catback exhaust description and removed "true". The correct title is now "02-09 Trailblazer 6cyl Dual 2.5" Exhaust System Catback (http://www.stainlessworks.net/cart/product_info.php?cPath=382_523_536&products_id=1869)". Thanks for pointing this out. Sometimes the our web guy can get a little confused!;)

[StainlessGuy]

I would like to see a pic and c=video of the single side outlet exhaust? Is it a cat back set up? How much does it cost, Don'y know which one it is on the price list.
We do not have any video or pics of the single side exhaust installed. The next one we get in I will post some pics and video.

[Zero]

nice to see the sw works guys throwing up some more vids and pics. but we really need some dyno numbers. soon enough hopefully.

[StainlessGuy]

We are working on finding a suitable candidate for the dyno testing. We will keep you guys in the loop once we get some more info.

[Nexus1155]

So if i just buy the headers for the $740 will that mate up to the stock cats/exahust system?

[LMMJ]

So if i just buy the headers for the $740 will that mate up to the stock cats/exahust system?

No. You would need this kit
http://www.stainlessworks.net/cart/product_info.php?cPath=382_523_536&products_id=1866&osCsid=88d489db8ed68768a319f2d502e424cb

[BUC NASTY]

they should have a thanksgiving or blackout discount...

[bigredtank]

damn so tempting!!! but thats a new set of rims! imma have to save my lunch money for a few months for this one. but like said before i wanna see pictorials and maybe a sound clip or two.

[crazytb]

any news on numbers???

[chevtrlblzr]

I have a question that I don't think has been ask.
The stock exhaust maniflod uses TTY bolts that are snapping off for people.
With these headers, do they also use TTY bolts or regular style bolts?

Just curious if putting these headers on would solve the cracking manifold issue as well as the broken bolt issue.

[WOOLUF1952]

I don't know about the bolts, however since the factory exhaust manifold is gone , it won't matter if it cracks or not.:m2:
The '03 service manual says nothing about TTY bolts. Only to torque the bolts in sequence, three times, to 15 ft. lbs. each pass.

[the roadie]

I thought TTY bolts were only used on cylinder heads, not manifolds. The manifold bolts are small, and relatively weak. Not TTY technology.

[chevtrlblzr]

OK, my bad - I thought I read that they were TTY and that's why they were snapping. Even if I did read it - it ain't so.
Thanks

[05TB86TA]

What would be the reason for having the different sized primaries? I'm guessing a stock trailvoy would use the 1-3/4" and a more modded truck would use the larger 1-5/8". Or is it to mate up with the cat size? I currently have the stock cat with a magnaflow catback. I only changed my exhaust after the cat so I shouldn't have an issue matching the header with the stock components right?

~Matt

[BUC NASTY]

What would be the reason for having the different sized primaries? I'm guessing a stock trailvoy would use the 1-3/4" and a more modded truck would use the larger 1-5/8". Or is it to mate up with the cat size? I currently have the stock cat with a magnaflow catback. I only changed my exhaust after the cat so I shouldn't have an issue matching the header with the stock components right?

~Matt

1-3/4 are recommended for little mods such as exhaust and intake. But 1-7/8 are recommended for bigger mods such as cams, nitrous, and etc.

Choose wisely...

[BUC NASTY]

subscribed!

[05TB86TA]

Ok thanks. 1 3/4" it is then. I saw the earlier post about needing the header, y-pipe and 2.5" cat to match the stock exhaust. So looks like I'll have to spend the $1350. Is the stock cat 2.5" ?

~Matt

[the roadie]

subscribed!For everyone's benefit, there is a "Thread Tool" for subscribing to a thread without contributing to post pollution. Thank you. :tiphat

[Zero]

Has any member who bought this header kit, gona to get Dyno #'s?

Does anyone know how much power increase there is, and at what rpm its at?

What part of the power band is affected most?

And lastly, why does the kit go down to a 2.5" exhaust tbe, when stock is 2.75".....shouldnt the pipes be the same size as stock or larger to increase flow and improve volumetric efficiency.



thanx,

Z

[BUC NASTY]

Ok thanks. 1 3/4" it is then. I saw the earlier post about needing the header, y-pipe and 2.5" cat to match the stock exhaust. So looks like I'll have to spend the $1350. Is the stock cat 2.5" ?

~Matt

The stock cat seems a lot smaller than 2.5 when we installed the headers.

For everyone's benefit, there is a "Thread Tool" for subscribing to a thread without contributing to post pollution. Thank you. :tiphat

I know. I accidently clicked on the wrong thread's subscribed link, which is why i wrote "subscribed!" on this thread so that i can get the email notifications.

And lastly, why does the kit go down to a 2.5" exhaust tbe, when stock is 2.75".....shouldnt the pipes be the same size as stock or larger to increase flow and improve volumetric efficiency.

Because the bigger the pipe the lesser exhaust velocity which can can cause a decrease in performance and mpg. Its like air flowing in the tube but not exiting as fast as possible if the pipe was bigger in diameter. SW made the headers smaller for a reason....for performance! If we I6s were v8s then this would be a different story.

[BUC NASTY]

Well, we finally got the headers installed! :woot:

92689269
92719270

[Africandude13]

Well, we finally got the headers installed! :woot:

92689269
92719270

Any chance of getting some Numbers on a Dyno ??

[BUC NASTY]

Any chance of getting some Numbers on a Dyno ??

Dont know how to do the dyno but i did notice an increase in torque, meaning more power on low throttle. I did also notice an increase in gas mileage, prob due to the sufferage of the dual exhaust with OEM exhaust manifolds.

[05TB86TA]

Sweet :thumbsup:

Did you install the headers, y-pipe and 2.5in cat package?

~Matt

[BUC NASTY]

Sweet :thumbsup:

Did you install the headers, y-pipe and 2.5in cat package?

~Matt

Yup! But becarefull when removing the exhaust manifold bolts because they might break. Two of my bolts got broken, the first one and the last one. Use a blow torch to help remove the bolts is RECOMMENDED!

[Zero]

can you post some pics from under the truck? Did you lose any ground clearence?

[BUC NASTY]

can you post some pics from under the truck? Did you lose any ground clearence?

You seemed hesitant of purchasing these headers? Yeah I know seeing is believing but I will post some pictures under the truck as soon as I get the chance.

To answer your question, headers are more closer to the lower part of the frame compare to the oem cat converter. Its about 1 or 2 inches above the frame. Overall, the entire kit above the frame so dont worry about the ground clearance.

[Africandude13]

Would you say it's worth the 1K+ for the headers?

[palitoiii]

Hey Buc Nasty now that you have the headers. Is your check engine light on? Or is everything ok? Also which one of the kits did you get?

[BUC NASTY]

Hey Buc Nasty now that you have the headers. Is your check engine light on? Or is everything ok? Also which one of the kits did you get?

Well for about hundred+ miles there was no engine light until now which was P0420. I kept removing/blocking the code but it still shows up so you need a tune to adjust it so that it the code wont pop out anymore. Also no O2 sensors are near as new. Ill need a wideband to adjust the tune to get rid of the engine light but its still fine with the engine light on.

But overall gain some performance with the headers. Ive got the single Y pipe

[bigredtank]

man im so tempted!!! im done with my exhaust set up i have! the drone the lack of any kind of performance gain. tax return time comes around.... imma have to put the rims on hold and order my set up.:woot:

[BUC NASTY]

Hey Buc Nasty now that you have the headers. Is your check engine light on? Or is everything ok? Also which one of the kits did you get?

You need this to stop the engine light from popping thanks to Luis!
http://i21.photobucket.com/albums/b273/focaljet/non-fouler%20o2cheat/12.jpg


can you post some pics from under the truck? Did you lose any ground clearence?

9646
9647
9648
9649

[LMMJ]

I only used one spaces Buc but I guess 2 will work the same. Been like 2 months now I think since I did mine and no check engine light. Going to get emission tested sometime this week hopefully so we'll see what happens.

[BUC NASTY]

I only used one spaces Buc but I guess 2 will work the same. Been like 2 months now I think since I did mine and no check engine light. Going to get emission tested sometime this week hopefully so we'll see what happens.


That pic of the o2 spacer is not mine. I just used at as an example of what you told me to put on my sensors. I just got the spacer installed today but later did received the code, which had been at least 2 weeks since the last time i got an engine light. I had to readjust my tune so we will see if the spacers does work this time. I might have to install a second spacer due to the adjusted airflow but we will see.

[joemoto311]

That pic of the o2 spacer is not mine. I just used at as an example of what you told me to put on my sensors. I just got the spacer installed today but later did received the code, which had been at least 2 weeks since the last time i got an engine light. I had to readjust my tune so we will see if the spacers does work this time. I might have to install a second spacer due to the adjusted airflow but we will see.

no offense but you might never get rid of that code....my z-71 started throwing codes after i put my headers and super coils on..i forget the code number but it had to do with emissions and low resitance to all banks..tune didnt help and everything i tried didnt help...I actually ended up giving in and taking it to a performance shop and they couldnt get the code cleared either so they didnt charge me....I tell you what though that truck ran better than it ever did no problems what so ever so i just left the code and got over it

you could always pull a simpsons moment and do what homer did.....just put electrical tape over it lol

[Zero]

SO people are paying $1000+ on a set of headers, that dont already come with the 02 sensor mounted properly (needs spacers), and that the check engine light will never go away??????

These are quality control issues that the designers and engineers should have looked at, no?

Are they gona be making a fix for the kit?

They look like a great set of pipes, but if I am gona spend top dollar, Id like a product to perform properly right out of the box , ya know.

We put headers on all kinds of GM's, ford, chevy, new and old. Companies like hooker, and edelbrock, ect. dont have these issues. So there must be some way to fix these issues.

Right now I am having a hard enough time dealing with the messed up speedo and shift settings from my PCMForless tune. id rather not purchase another mod that is only gona give me frustration.

[BUC NASTY]

SO people are paying $1000+ on a set of headers, that dont already come with the 02 sensor mounted properly (needs spacers), and that the check engine light will never go away??????

These are quality control issues that the designers and engineers should have looked at, no?

Are they gona be making a fix for the kit?

They look like a great set of pipes, but if I am gona spend top dollar, Id like a product to perform properly right out of the box , ya know.

We put headers on all kinds of GM's, ford, chevy, new and old. Companies like hooker, and edelbrock, ect. dont have these issues. So there must be some way to fix these issues.

Right now I am having a hard enough time dealing with the messed up speedo and shift settings from my PCMForless tune. id rather not purchase another mod that is only gona give me frustration.

I dont think you need the spacers because when I had the spacer the light still light up.

What the guy said is wrong. You can get rid of the engine code. Its just depends which program you used to shut off the engine codes (hint....hptuner....pcm4less)

no offense but you might never get rid of that code....my z-71 started throwing codes after i put my headers and super coils on..i forget the code number but it had to do with emissions and low resitance to all banks..tune didnt help and everything i tried didnt help...I actually ended up giving in and taking it to a performance shop and they couldnt get the code cleared either so they didnt charge me....I tell you what though that truck ran better than it ever did no problems what so ever so i just left the code and got over it

Actually you can get rid of the code. If i recall it was P0420. Ever since I got the hptuners I was able to get rid of the code from lighting up. Efilive couldn't do it. As a result the engine light never popped out not even once and its been three weeks already.

[joemoto311]

good **** then....my ecm intruck wouldnt clear it

[BUC NASTY]

good **** then....my ecm intruck wouldnt clear it

Either use an hptuner or ask pcmforless to remove the code for you.

[Zero]

Thank you for the correction. It is nice knowing that there is a way to kill the check engine light, and that the spacers are not needed.

For those of you that have this kit, is there anything you have changed or add?

I want to know what I am getting into, and if there are any other parts that may improve things.

[BUC NASTY]

I want to know what I am getting into, and if there are any other parts that may improve things.

Three things:

1) You may need some spare head gasket bolts if the installer breaks them. Tell the installer to use a blow torch to remove the exhaust manifold bolts or else he my destroy the bolt and will have a hard time removing them in the engine. My installer end up break only two bolts, the very first and last bolt but they still hold up fine.

2) May need a high temp seal for the head gasket and when the installer installs the end pipe thats connects to the exhaust pipe.

3) Definately a TUNE!!!...someone that can use hptuners:coffee

[Zero]

check :thumbsup:

[MikeyDizzle]

Still no dyno numbers????
:confused:

[LMMJ]

Thank you for the correction. It is nice knowing that there is a way to kill the check engine light, and that the spacers are not needed.

For those of you that have this kit, is there anything you have changed or add?

I want to know what I am getting into, and if there are any other parts that may improve things.

Any vehicle you install headers with high flow cats WILL throw a CEL, Period. The "anti-fouler" spacer I installed fooled the PCM as to the function of the cat. My truck only needed one because it has true duals with dual cats. The O2 sensor only sees flow from 3 cylinders so only 1 spacer was needed. With the standard header/y pipe only 1 high flow cat is used for all 6 cylinders so I think it will need two. It has nothing to do with sensor placement. You can get a tune to shut off the CEL but I didn't want to mess with that, Yet. That sensor does nothing but measure cat efficiency. As far as I know it will not mess with anything performance related. It'll just throw the CEL.

Also, reason their are no dyno numbers is due to the fact that no one with a bone stock TB has gotten them. CAI and a tune (my truck) won't give accurate numbers. I've been waiting for a dyno day over here (for a discount) cause the normal rates are hella expensive.

[benstep11]

Also, reason their are no dyno numbers is due to the fact that no one with a bone stock TB has gotten them. CAI and a tune (my truck) won't give accurate numbers.

For a free set, I'd be willing to throw the stock CAI back on and donate my truck for however long it takes. Just sayin'.

:D

[LMMJ]

For a free set, I'd be willing to throw the stock CAI back on and donate my truck for however long it takes. Just sayin'.

:D
I should have. My set wasn't free but I should have. I had stock intake and PCM ready BUT they wanted a stock exhaust also. That, I wasn't willing to re-install. My truck had the Magnaflow catback at time of install. I also had upgraded to 3.73s from 3.42s. So my truck wasn't all that great of a dyno candidate. I'm not helping much either by not getting my truck dyno'd tho :x

[palitoiii]

So is the CEL issue with these headers is it taken care of? Or is there some special thing that I would have to do like you guys that have purchased it have mentioned.

Which is the best set of the headers to get if i want to keep it smog legal and planning on a future Magnaflow catback Dual outlet exhaust kit?

[ScarabEpic22]

So is the CEL issue with these headers is it taken care of? Or is there some special thing that I would have to do like you guys that have purchased it have mentioned...

HPTuners can kill the codes, unfortunately EFILive is hit or miss. Seems like it depends on what year and what OS you are running, some work fine but some dont do anything.

[LMMJ]

So is the CEL issue with these headers is it taken care of? Or is there some special thing that I would have to do like you guys that have purchased it have mentioned.

Which is the best set of the headers to get if i want to keep it smog legal and planning on a future Magnaflow catback Dual outlet exhaust kit?

http://www.stainlessworks.net/cart/product_info.php?cPath=382_523_536&products_id=1866&osCsid=c30e237c695e2bd7fded99f21469681a

We have to wait and see if 2 spacers is enough to kill the CEL on Buc's TB. You need the same kit she got.

I just passed emissions this past Saturday and no stored or active codes were there. The CEL has been off for months now.

[BUC NASTY]

http://www.stainlessworks.net/cart/product_info.php?cPath=382_523_536&products_id=1866&osCsid=c30e237c695e2bd7fded99f21469681a

We have to wait and see if 2 spacers is enough to kill the CEL on Buc's TB. You need the same kit he got.

As of this day no light has popped out just by shutting of the light w/ hptuner. Ill turn the light back on when the Ac bearing comes in, which is when we will get the 2nd spacer installed and see if the light pops out again or not.

[ScarabEpic22]

As of this day no light has popped out just by shutting of the light w/ hptuner. Ill turn the light back on when the Ac bearing comes in, which is when we will get the 2nd spacer installed and see if the light pops out again or not.

Good test to see if HPT can really kill the codes (I believe it can now), let me know what you find out!

Still thinking about buying HPT in a few months for the 02...

[BUC NASTY]

We just replaced the Ac bearings, used a EXT serpentine belt and added an extra spacer on the o2 sensor and the truck is no longer sluggish off the line anymore. No lights have popped out and it feels like a brand new car with more power now.


I think im starting to understand why the engine light pops out. Of course we know it has something to do with the high flow cats disrupting the o2 sensors but without the spacers the truck turns sluggish and makes the engine create misfires, which is why you need (in my case 2) spacers.

BTW Luis, The ext serptine belt is a perfect match for my alternator that comes with a small pulley. Its only 1 inch shorter than a regular size tb belt.

[chevtrlblzr]

I think im starting to understand why the engine light pops out. Of course we know it has something to do with the high flow cats disrupting the o2 sensors but without the spacers the truck turns sluggish and makes the engine create misfires, which is why you need (in my case 2) spacers.

While I was reading this thread, I wondered about that.
I saw it mentioned to use a program to turn the light off caused by the O2 sensor. I thought that isn't a good idea because the computer is still getting the lean (or whatever) signal - even if you canceled the light.
That's kind of like taking the battery out of your smoke detector so you won't have a fire.??

[BUC NASTY]

While I was reading this thread, I wondered about that.
I saw it mentioned to use a program to turn the light off caused by the O2 sensor. I thought that isn't a good idea because the computer is still getting the lean (or whatever) signal - even if you canceled the light.
That's kind of like taking the battery out of your smoke detector so you won't have a fire.??

Exactly! Thats why you need the spacers. Im still testing the tune with the engine light on to see if this mod works.