Had an 01, now have an 09. I used an Edge tuner, 5" exhaust, and cold air intake on my last truck and had great results without any funky codes or problems. The 09 is still bone stock but I plan to use the same plan on it.
Tuner, exhaust, intake. Makes these things a LOT more fun to drive. My 01 would get 20-21mpg pretty consistently (2500hd 4x4 with 285s).
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You remind me of the timing on a turbo engine...
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