Hollow out Air box - Page 4 - Chevy TrailBlazer, TrailBlazer SS and GMC Envoy Forum

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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 > Air Induction

Air Induction Performance Air Intake/Air Induction Modifications

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Old 09-27-2008, 08:13 PM
paul336p paul336p is offline
Junior Member
2004 Chevy TrailBlazer LT
Majestic Red Metallic 4.2L I6 4X4
Join Date: Aug 2008
Location: Augusta, GA
Posts: 21
Air Box Mod

I did this mod and lost about 3 miles a gallon. Hollowing out the box allows it to get to hot creating the air intake temperature to rise. The single layer of plastic just isn't thick enough to absorb the engine heat. Do not do this mod if you are trying to save gas mileage. Same situation if you remove the air box completly. Done both of them and don't recommend either one.
I went a bought a Volant CAI and got my 3 miles a gallon back + 2 more. Best way to go even though they can get pricey..
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Old 09-27-2008, 08:56 PM
lilzip24 lilzip24 is offline
Join Date: Jan 2008
Posts: 64
im definatly tryin to save on gas
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