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A programmer/tuner adds about 25 Hp and better shifting. Plus, if you get the Edge of the Gryphon, you get gauges to monitor many functions. Best mod I have made.
Intake and exhaust together will make a difference. Add a programer to the equation and you will deffinatily see a big difference in performance. I have all 3 and the performance is night and day compaired to bone stock.
I installed the Magna-flow first...great sound, no gains.
Next came the Volant CAI...great sound, no gains in mileage or performance.
Added the Edge...Holy Crap, brand new truck.
With all mods together the truck sounds and performs great . Still no mileage gains that I can tell, but I really get on the pedal. If I laid off it I wouldn't be surprised if I got a 1 or 2 mpg more out of it.