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exhaust isnt gonna do a ton power wise, but you may notice a small difference and its great for your motot. i definately like the idea of cetane booster as said above, most 6.0's it seems to make run consicerable better with a little more power.......other than that the only thing you could really do is play with gear ratios in your diff (expencive if its a four wheel drive though as both have to be done to keep the same gear ratio front and rear)......but that will just give you more take off power and hurt topp end.......ive heard some claim unplugging the EGR valve helps some, but this is gonna give you an annoying check engine light all the time and i wouldnt reccomend it as it could result in excessive carbon in the intake.......a water/meth or propane set up in the intake could give you some more, but unless its removable i would suspect the dealers arent gonna like it too much warranty wise.....if i was you i and was worried about warranty....i would get a plug and play tuner like superchips or something along those lines, tune it, and know if you have to take it in for warranty work, first you need to program it back to stock, and then you need to disconnect both battery cables for about a half hour or so to clear the code the proogrammer set..........Marc
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