Not sure which 2004 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:
"The K&N 77 series metal intake kit was a great addition to my truck. You could really feel the difference in acceleration. It also increased mpg especially on long trips." —Rosendo B from Sullivan City, TX bought a K&N 77 Series Metal Intake Kit for a 2004 GMC Sierra.
"I noticed a nice gain throughout the range and i love the whistle" —Chad M from Towanda, PA bought an Airaid PowerAid Throttle Body Spacer for a 2004 GMC Sierra.
"First of all i noticed the change in the throttle response. The truck accelerates much smoother, faster and louder. It was easy and simple to install, just follow the instructions! However, the best thing about this product is the enhancement of the motor sound, and better gas mileage when cruising on the highway, along with the looks under the hood. The extra horse power? Yes its definitely there!!! I highly recommend it." —Angel A from Angleton, TX bought a K&N 77 Series Metal Intake Kit for a 2004 GMC Sierra.
"You need to have K&N Oil on hand for the filter. Verry easy to install, It Looks Good. Don" —Don R from , bought a Spectre Cold Air Intake for a 2004 GMC Sierra.
"I like everything about this intake as stated in rating. however the directions were of little help. the photos would have made it simple except they were of such poor quality I had a hard time making out what i was looking at. Finally i just threw them away and put it together simply by looking at the picture on the box." —Dennis B from Scottsdale, AZ bought a Spectre Cold Air Intake for a 2004 GMC Sierra.
"Improved acceleration, throttle response is so much better now. Instillation wasn't to bad, I had to trim off some of the fan shroud so it would fit better. Haven't noticed any better mpg yet but that's because I can't keep my foot off the gas. lol." —Brandon C from Gaylord, MI bought a K&N 57 Series FIPK Air Intake (Fuel Injection Performance Kit) for a 2004 GMC Sierra.
"Already getting better mpg after two weeks... Can hear it and feel it when I push down the petal..overal good product" —Alex H from Clifton, CO bought a K&N 57 Series FIPK Air Intake (Fuel Injection Performance Kit) for a 2004 GMC Sierra.
"Installation was easy enough, noticeable change in throttle response. Slight whistle during acceleration. Overall a real good buy" —William W from Germantown, MD bought a K&N 77 Series Metal Intake Kit for a 2004 GMC Sierra.
"Well, what can I say that hasn't already been said about K&N they are great! Auto anything is one of the BEST car bizs I've had the pleasure of doing biz with. 100% great and I'm going to make an order right after writing this. Keep up the great work, and thanks for everything!!!" —Steve D from Highland , MI bought a K&N 57 Series FIPK Air Intake (Fuel Injection Performance Kit) for a 2004 GMC Sierra.
"very easy to put in, best price i've found through multiple web sites. had to trim 1/2 " off the rubber boot for fan clearance but simplest install. for the people that complain about the difficulty of installation, they should give their wives their tools back and have them put it in. i put it in roughly 20-25 minutes while talkin on the phone to a buddy i havent talked to in awhile. makes a nice rumble as soon as you go over 2,000 rpm's. great productmike boston ma" —Mike C from Wakefield, MA bought a Spectre Cold Air Intake for a 2004 GMC Sierra.
"Was anxious to get this because I have wanted one for a couple of years. After installing I could immediately see more power and a slight change in sound. It looks great too! So far, I haven't noticed any difference in gas mileage, but I figure it will really help on the road. Right now I am just driving short trips close to home and work." —Michael M from , bought a Spectre Cold Air Intake for a 2004 GMC Sierra.