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It will come on if its an off road pipe if you dont have MIL eliminators to tell the computer that the emissions are clean. Thats the only reason it will come on.
I just installed my x-pipe and I feel serious power gains, and I think I might have an exhaust leak. Either way it was the biggest mod I have done so far 2nd gear and 3rd gear have come alive. If you are in SOuth Florida PM me I can shut off your CEL if you don't want to buy the tuner.