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2,112 Posts
You are on the right track with the "chip", but you may be more interested in the Hypertec programmers. They just plug into your dianostic port (right under the dash) and you answer some questions based on modifications and the programmer reconfigures your stock computer to maximize any performance parts you have installed (you Header and exhaust). I am not sure that Hypertec has one for the '05's yet, but I know they did through '04, so it's worth a shot. I know that 4wheelparts.com would have them, but not sure if they would be the best price. I would recommend shopping around.
