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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 09-26-2017, 09:44 PM
bhearts77 bhearts77 is offline
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2005 GMC TrailBlazer LS
Black Granite Metallic 4.2L I6 4X4
Join Date: Sep 2017
Location: US
Posts: 8
Uel header

Inline 6 got me wondering, why not make a custom exhaust manifold with an unequal length runner, see what kind of sounds I can get. I found the Dorman brand manifold to replace my cracked factory piece. I figure I'll just chop the collector off and run the first bank 2 foot of tube and the second bank 3.5 feet before merging. Lmk what you think. Just looking for a little more rumble sound.

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  #2  
Old 09-29-2017, 01:32 AM
bhearts77 bhearts77 is offline
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2005 GMC TrailBlazer LS
Black Granite Metallic 4.2L I6 4X4
Join Date: Sep 2017
Location: US
Posts: 8
Could anyone answer for me if this head flange pattern would work on an 05?

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  #3  
Old 03-07-2018, 07:37 PM
MCTECHMARK MCTECHMARK is offline
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red Chevy 4.2
Cranberry Red Metallic 4.2L I6 2WD
Join Date: Feb 2018
Location: oklahoma city, ok
Posts: 1
exhaust

the easiest way to confirm if they will match up is to get the correct exhaust manifold gasket.
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