| Exhaust would be a good start. You Will gain some MPG. Then again you can buy a tuner and get better MPG and power.
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2500HD Allison
8" Fabtech Suspension Lift
37" Pro Comps
20" Gear Wheels
Quadzilla S2 on 90hp
Autometer Ultra-lites (Boost/Pyro)
Straight piped & 5" Tip
Ported Mouthpiece
Resonator Plugged |