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Go Back   Chevy TrailBlazer, TrailBlazer SS and GMC Envoy Forum > 2002 - 2009 TrailBlazer/Envoy Tech > 02-09 Vortec 4.2L I-6 Engine and Drivetrain > Exhaust Mods

Exhaust Mods Performance Exhaust Modifications

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  #1  
Old 04-06-2015, 08:49 PM
skywalkerlt5 skywalkerlt5 is offline
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2004 Chevy TrailBlazer LT
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headers on a 04

hey Guys, have an 04 and thinking of putting a Kooks header on. understand there is a difference in Cyl heads in later years. is there a big improvement to be had with the later cyl head?? and if so can the 05 and up header be installed on the early head and the head be changed at a later date?
Thanks, Rob
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Old 04-06-2015, 11:23 PM
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The Neens The Neens is offline
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The difference is in the muffler connection...I used a later model header on my '02 and had to modify the muffler pipe...
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Old 04-06-2015, 11:45 PM
skywalkerlt5 skywalkerlt5 is offline
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Thanks for the reply, good to know. Did you notice a difference after installing the header?
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Old 04-06-2015, 11:50 PM
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The Neens The Neens is offline
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It definitely made a difference...Not sure if it's worth $900+, but fortunately I found a used one, which was the reason for the pipe mod...
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Old 04-07-2015, 12:16 AM
skywalkerlt5 skywalkerlt5 is offline
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Thank you.
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Old 06-28-2015, 09:53 PM
Quik5oh Quik5oh is offline
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Quote:
Originally Posted by The Neens View Post
It definitely made a difference...Not sure if it's worth $900+, but fortunately I found a used one, which was the reason for the pipe mod...
Which system do you have from Kooks? Looks like they have a couple different setups with a cat. What are some of the improvements/benefits that you noticed? Are you running the stock muffler? Any issues with heat in the engine compartment with a heat shield, etc.?

Thanks!
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Old 07-01-2015, 05:17 PM
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The Neens The Neens is offline
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2002 Chevy TrailBlazer LS
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Quote:
Originally Posted by Quik5oh View Post
Which system do you have from Kooks? Looks like they have a couple different setups with a cat. What are some of the improvements/benefits that you noticed? Are you running the stock muffler? Any issues with heat in the engine compartment with a heat shield, etc.?

Thanks!
I'm running the later model header/cat in my '02 with a Walker muffler...Definitely runs better, not sure about any MPG improvements...No issues with heat...Had to move trans dipstick and use some hi-temp heat wrap, but nothing you can't handle...
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