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Hi all,
I have an 04 suburban 4x4 5.3l.
I was wondering if anyone out there has installed a K&N cold air and could tell me if it helped mileage at all. I do little to no towing and only put 5k on a year.
Any comments would be appreciated.
The low mileage is killing me at the pump.
thanks
 

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A Hypertech programmer will probably get you better mileage. There are some posts about this.
 

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The K&N will help a little. Exhaust will help a little also. Intake, Exhaust, and the programmer will show the most gain.
 

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Got an '04 2wd with a 5.3. I put an "air raid" intake with a TB spacer. I up'd the exhaust from a 2.5" to a 3" and did a programmer. The best milage I've gotten was 20.5 mpg with about an 85/15% highway/city mix. But don't forget the extra 40 - 50 hp. Worth every penny! Hope this helps you decide.
 

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The K&N will help a little. Exhaust will help a little also. Intake, Exhaust, and the programmer will show the most gain.
:great: well said
 
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