| I second Ryan's comment. Out of all the exhaust systems i love my silverline 4". Anything you do to make your engine breath in and out easier will improve your mileage, not dramatically, but every bit helps. But i think your best bet to see a noticeable improvement in mileage is a tuner. I am seeing anywhere between 21-23 mpg highway. When loaded down i get around 12-14.
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James-
06 2500 HD SC 4x4 Duramax/Allison
4" turbo back silverline
AFE Magnum intake
PPE Xclerator Hot +2
Suncoast Stage V with triple disc TC
285 bfg all terrains
Ranchhand bumpers front and rear |