Not sure which 2003 GMC Sierra Air Intake Systems are right for you? We have over 15237 customer reviews, with an average rating of 4.5, to help you find exactly what you're looking for. Here's what some of our customers have said:
"my sierra hd is bad , my 6.0 is alot more tough now my k&n complements my series 40 flowmaster duals it screams with full throttle I don't see a big mpg improvement but i can't keep my foot out of the throttle. when i rev it i can here that K&N sucking air it is cool. and the stainless tube looks great!" —Michael L from Monroe, MI bought a K&N 77 Series Metal Intake Kit for a 2003 GMC Sierra.