Review on K&N Cold Air Intake Kit: Boost Horsepower & Performance on Compatible 2002-2004 CHEVROLET Avalanche 1500 (57-3033) – 50-State Legal by Payton Luna

First of all, the excellent price and the fast delivery convinced me. I received in 2 days. Easy installation, about 30 mins. Very noticeable engine roar when accelerating, like having a performance exhaust (I have it in stock right now). Noticed slightly quicker kickdown acceleration. I haven't noticed an increase in fuel economy yet, but it's hard to keep gas without gas because of the noise it makes. The easiest and fastest performance upgrade you can make.