Exhaust Cutouts

[TX TBSS 06]

For all of you looking to upgrade with headers and mufflers, you might consider this for a little extra fun and performance...not a bad price either

http://www.dmhperformance.com/

[Supercoolin]

For all of you looking to upgrade with headers and mufflers, you might consider this for a little extra fun and performance...not a bad price either

http://www.dmhperformance.com/

Post some pictures when you have yours installed :) :)

[SoCalSS]

The servos from those motors are no good. You're better off with these.
http://www.quicktimeperformance.com/QTEC/index.php

[VTODD]

The servos from those motors are no good. You're better off with these.
http://www.quicktimeperformance.com/QTEC/index.php

ive heard the same thing about the DMH cutouts. i have had QTP cutouts for awhile now. i even bought them used over a year ago. i havent had any problems at all. if a QTP cutout ever goes bad, you send it to QTP and pay a flat rate of $30 and they fix everything back to new that is in need of that, basically.

todd

[TX TBSS 06]

Thanks for the tips...I actually had the QTP's installed yesterday. I wish I could capture some video for you guys...it sounds awesome.

[cgseanp]

stupid question, but do you need an aftermarket exhaust to run a cut out?

[TX TBSS 06]

Nope, thats the main reason I wanted it. I have clients riding with me during the week and I didnt want anything louder than the stock exhaust...

...Now with a flick of a switch, its much much louder.

The muffler shop was able to squeeze the 3" cutout, about 10-12" long in between the flange and the stock muffler...it was pretty easy.

[RRCarter]

So where does the law stand on cutouts.......if someday I would have to go through emisions for whatever reason?

[TX TBSS 06]

Actually, I am not really sure. In TX we are required by law to run catalytic converters and the exhaust must exit the cab. I have the cutout after the cat, so I'm safe there. I do not have it exiting the cab, so not safe there. However, all I would have to do is flange up a 3" pipe after the cutout and route it to clear the cab, prolly right in front of the drivers side rear wheel. I think if the pipe was in there, it would be completely legal.

[tbssny]

Nope, thats the main reason I wanted it. I have clients riding with me during the week and I didnt want anything louder than the stock exhaust...

...Now with a flick of a switch, its much much louder.

The muffler shop was able to squeeze the 3" cutout, about 10-12" long in between the flange and the stock muffler...it was pretty easy.
What was the part # on the one you bought?? did you say you had the stock system still?

[cgseanp]

ok so another dumb question.. by using this cut out and bypassing the muffler or whatever it does, does that give noticeable gains in power, other than just the sound?

[TX TBSS 06]

Heres the part for the motor and valve:

http://store.summitracing.com/partdetail.asp?autofilter=1&part=QTP%2DQTEC30&N=700+4294923429+4294920534+115&autoview=sku

Heres the part for the cutout:

http://store.summitracing.com/partdetail.asp?autofilter=1&part=QTP%2DQTEC30&N=700+4294923429+4294920534+115&autoview=sku

You can also buy these directly from QTP/QTEC (althought I dont know what they charge to ship) :

http://shop.quicktimeperformance.com/cart.php?m=product_detail&p=25

[TX TBSS 06]

ok so another dumb question.. by using this cut out and bypassing the muffler or whatever it does, does that give noticeable gains in power, other than just the sound?


Power gains are minimal as the stock exhaust has miminal restriction. You might notice a few rear wheel horsepower and maybe at most 0.1 better in the 1/4 mile. Some of the other guys might have checked it on a dyno/track.

I like it more for the intimidation/sound.

[tbssny]

On a scale of 1-10 10 is the loudest how loud is it over stock being 1:) what if it fails does it stay open or closed:confused:

[TX TBSS 06]

On a scale of 1-10 10 is the loudest how loud is it over stock being 1:) what if it fails does it stay open or closed:confused:

With just stock manifolds and cats, its about 8-8.5. If you had headers, it would be a 10.

If it fails open, you can remove the motor and put a plate on the flange to seal it off. If it fails closed, no problems. Its held on with 3 bolts, so its easy to get off and on. If it ever breaks, ill send it back.

[TX TBSS 06]

I have some videos, although they arent very good quality (taken with my cell phone).

I havent had any luck uploading to putfile or photobucket because of the tpe of video that it is (3GPP). I have posted on the video forum asking if someone can convert, but until then, if anyone wants me to email them the vids, just send me a PM.

[skinnies]

Power gains are minimal as the stock exhaust has miminal restriction. You might notice a few rear wheel horsepower and maybe at most 0.1 better in the 1/4 mile. Some of the other guys might have checked it on a dyno/track.

I like it more for the intimidation/sound.

Here's some testing I did with the cutout...

http://forums.trailvoy.com/showthread.php?t=12726

As far as DMH goes, they make a good quality product with a 4 yr warranty. No matter which cutout you go with, it will break at some point, they are just not something that will last a long time, that being said, having a 4 yr warranty is very nice. I've had lots of buddies run them and all have loved them.

I will be getting more pics of my install and doing a full writeup on the install of the electric cutout soon. :)

[TX TBSS 06]

Aight, got the videos converted and uploaded. Special thanks to Mada123 for converting to the right type file.

Click here to watch 25-60-Punch (http://media.putfile.com/25-60-Punch) - This one was my favorite. I got a real nice 1st to 2nd scratch, as can be seen by the speedo jumping.

Click here to watch 25-75-Punch (http://media.putfile.com/25-75-Punch)

Click here to watch 40-70-Punch (http://media.putfile.com/40-70-Punch) - I started too fast on this one to get it to drop down to 1st gear...still sounds good.

Click here to watch Open-and-Close-Electric-Cutout (http://media.putfile.com/Open-and-Close-Electric-Cutout)

Click here to watch Electric-Cutout-Rev (http://media.putfile.com/Electric-Cutout-Rev) - I tried to rev it up with it open, the mic on the phone didnt pick it up that well, just sounds like a bunch of noise.

[blktbon20s]

Aight, got the videos converted and uploaded. Special thanks to Mada123 for converting to the right type file.

Click here to watch 25-60-Punch (http://media.putfile.com/25-60-Punch) - This one was my favorite. I got a real nice 1st to 2nd scratch, as can be seen by the speedo jumping.

Click here to watch 25-75-Punch (http://media.putfile.com/25-75-Punch)

Click here to watch 40-70-Punch (http://media.putfile.com/40-70-Punch) - I started too fast on this one to get it to drop down to 1st gear...still sounds good.

Click here to watch Open-and-Close-Electric-Cutout (http://media.putfile.com/Open-and-Close-Electric-Cutout)

Click here to watch Electric-Cutout-Rev (http://media.putfile.com/Electric-Cutout-Rev) - I tried to rev it up with it open, the mic on the phone didnt pick it up that well, just sounds like a bunch of noise.
i really like it! Might have to get me one.

[dv_tbss06]

i love that idea man which one exactly do i need to get ? the 2 1/4 inch or the 3 inch ? not really sure, does anyone know where i can get it the cheapest ?? thaks really looking foward in getting one

[T-Blaze SS]

Seems like a stupid idea to me (other than the sound). With a blocked downpipe (cut-out closed) seems like there would be a parasitic LOSS of horsepower when the air got trapped and had to come back up the pipe to find its way out.

I bet the only reason they are measuring those high of gains is because they are measuring it closed versus open when closed is actuall worse than stock.

[TX TBSS 06]

i love that idea man which one exactly do i need to get ? the 2 1/4 inch or the 3 inch ? not really sure, does anyone know where i can get it the cheapest ?? thaks really looking foward in getting one

Go with the 3" - your stock exhaust is 2 3/4" and they can weld it up just fine. You definately dont want to go smaller than stock exhaust

[dv_tbss06]

perfect thanks man.....i love the sound with the magnaflow and resonator deleted im defenetly going to love the sound with the cutout !!!

[skinnies]

i love that idea man which one exactly do i need to get ? the 2 1/4 inch or the 3 inch ? not really sure, does anyone know where i can get it the cheapest ?? thaks really looking foward in getting one

www.dmhperformance.com and get the 3" one.

[TX TBSS 06]

Seems like a stupid idea to me (other than the sound). With a blocked downpipe (cut-out closed) seems like there would be a parasitic LOSS of horsepower when the air got trapped and had to come back up the pipe to find its way out.

I bet the only reason they are measuring those high of gains is because they are measuring it closed versus open when closed is actuall worse than stock.


I disagree with the statement about parasitic loss of horsepower due to gas travelling to the blockage and then having to go back up the pipe - this makes no sense if you know anything about fluid dynamics. The gas is going to follow the path of least resistance. With the valve closed, the path of least resistance is through the stock exhaust. The cutout portion (with the valve closed) will "fill up" with gas and the remaining exhaust will flow right past it down through the stock piping.

This is very similar to the misconception that dropping the tailgate on a pickup will provide better fuel mileage. In much the same way, the bed of the truck (with tailgate closed) "fills up" with air, and the air coming over the truck flows right over the bed and tailgate with essentially no drag on the truck.

[TonyGXP]

I disagree with the statement about parasitic loss of horsepower due to gas travelling to the blockage and then having to go back up the pipe - this makes no sense if you know anything about fluid dynamics. The gas is going to follow the path of least resistance. With the valve closed, the path of least resistance is through the stock exhaust. The cutout portion (with the valve closed) will "fill up" with gas and the remaining exhaust will flow right past it down through the stock piping.

This is very similar to the misconception that dropping the tailgate on a pickup will provide better fuel mileage. In much the same way, the bed of the truck (with tailgate closed) "fills up" with air, and the air coming over the truck flows right over the bed and tailgate with essentially no drag on the truck.

please elaborate?? If I open the window of my truck I can feel the resistance as opposed to closed, though using your method shouldn't the truck "fill with air" and then the remaining wind go around it?? Turbulance is inevitable IMO.. Maybe it's not a big enough drag to affect anything but it is there isn't it?

[TX TBSS 06]

please elaborate?? If I open the window of my truck I can feel the resistance as opposed to closed, though using your method shouldn't the truck "fill with air" and then the remaining wind go around it?? Turbulance is inevitable IMO.. Maybe it's not a big enough drag to affect anything but it is there isn't it?

Windows down is a slightly different scenario. With just one window down and the remainder of the vehicle sealed off, I would expect the same thing to happen. However, multiple windows down (multiple points of flow entrance/exit) would create a more complicated scenario.

I am in no way claiming to be an expert on the subject and everything I have offered above is my two cents, however, I have taken fluid dynamics courses during my schooling. The issue about the tailgate was something we discussed in depth as well as the purpose of spoilers on the back of cars for drag reduction.

However, dont take my word for it. I am sure you are familiar with the show "Mythbusters." They "busted" the theory that lowering the tailgate on a pickup provided better economy/less drag.

[Ghicks99]

Well whatever u do DONT get a qtp, they have the worst reputation when it comes to e-cutouts. Put a DMH and a QTP side by side and you can see that the DMH is a much better built piece. The DMH has a 4year warranty while the QTP only has a 90 day warranty, now thats what i call backing your product. But you can send them $35 after the warranty is up to repair the motor. So with that said, u decide which is best. This should make it a fairly clear decision