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2003 GMC Sierra Gas Saving Products

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Latest Customer Reviews

K&N 57 Series FIPK Air Intake (50-State Legal) Reviews


Eric' s 2003 Sierra breathing great!

Reviewed By Eric N (Yuma, AZ) Reviewed for a 2003 GMC Sierra —4/20/2017 8:40 PM

K&N is king! I love my intake! The added performance is undeniable. It not only makes my 03 Sierra run great, but it sounds great too. The installation wasnt as easy at it was made to seem though. The rubber sleeve that connects the throttle body and the intake was very short, causing the clamps to keep slipping off when I tried tightening them to secure the intake to the throttle body. And if you have a TBSpacer like i do, you have to cut some of your fan guard to make it fit. All worth it tho!

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DiabloSport inTune i2 Tuner Reviews


Great Tuner!

Reviewed By Scott R (SAINT PETERS, MO) Reviewed for a 2003 GMC Sierra —3/17/2016 8:55 AM

This tuner works great and is very fast and easy to change settings on my truck. Feels like a totally different vehicle now.

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DiabloSport Trinity T-1000 Programmer Reviews


The Devil made me do it, enhance my truck's performance, that is

Reviewed By james S (RIVERVIEW, FL) Reviewed for a 2003 GMC Sierra —9/10/2015 1:49 PM

This is my first foray into Tuning, but with this product, and a little research its point and click. Installation/use was easy, and tunes can be modded as you go. Easy to read, easy to navigate, easy to use (to a certain point, for a novice). And fun. You notice the differences in performance right away.

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