Not sure which 2004 GMC Sierra Air Filters - Custom Fit is right for you? We have over 14143 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:
"easy to install and seems to help my truck breath easier.hope mileage will get better but haven't had it long enough to check yet." —James N from Hinsdale, NH bought a K&N Air Filters for a 2004 GMC Sierra, 1500, 5.3L V8.
"DEFINITELY A SUPERIOR PRODUCT THAT WILL LAST FOR YEARS, WHILE STILL PROVIDING MAXIMUM PERFORMANCE" —James S from Turlock, CA bought a K&N Air Filters for a 2004 GMC Sierra.
"Installation was a breeze took less than 5 min. Fit perfectly. Fast shipping.
Thanks" —Jeffrey S from Trappe, MD bought a K&N Air Filters for a 2004 GMC Sierra.
"Throttle responce improved and general overall performance improved. I install K&N filters in all my vehicles , A GREAT PRODUCT !" —Stephen B from Fort Pierce, FL bought a K&N Air Filters for a 2004 GMC Sierra.
"To Whom It May Concern:
This is my second K&N filter. The first one was in a 2004 Gmc Envoy. The second in a 2004 Gmc sierra pickup. I did not purchase the entire cold air assembly, just the oem filters. I choose K&N filters because #1 one time purchase #2 slightly better fuel economy. #3 more power it seems that way as I pull a 30ft camper. So far I am pleased with my purchases, and would purchase again.
Randy K" —Randy K from Onalaska, WI bought a K&N Air Filters for a 2004 GMC Sierra, 1500, 5.3L V8.
"This air filter was a wise investment. I can tell it improved my gas mileage at least 2 or more miles to the gallon. That's great considering the cost of gasoline. It also gave a slight boost in horsepower too. Wise decision." —Brad F from Kinston, AL bought a K&N Air Filters for a 2004 GMC Sierra.
"I have found a nicer shift in the transmission, a slight increase getting off the line, and increace in gas mileage, if I keep my foot out of it. The passing gear kicks in easier, and the throaty sound sounds great." —Thomas M from Flint, MI bought a K&N Air Filters for a 2004 GMC Sierra.