Review on K&N Cold Air Intake Kit for 2004-2006 Chevy/GMC/Hummer (Colorado, Canyon, H3) 3.5L L5 - High Performance, Increased Horsepower, 50-State Legal (Part Number: 57-3043) by Chris Doe

2006 Hummer H3 3.5 I5 First of all why did they put such a bad engine in the Hummer. BUT it's an inexpensive way to increase horsepower, torque and fuel economy. I highly recommend. Easy install and it was fun. It sounds strange but working on your car creates a kind of connection, in any case the engine noise was much more significant when the engine was revving or when the pedal was pressed. Sounds like I added an exhaust system, keep that in mind when adding this. I have this and a Gibson exhaust and together they give a very significant boost in performance.