You don't need it for bolt ons, but almost every bike will run better with a PC....even a completly stock bike will run better with one....they are too lean from the factory
i've had my D&D's on my 06 for bout 3 weeks now and they're almost done breakin in i think and i do notice from time to time there's a bit of a backfire from them so I'm just lookin for a damn marble so i can do the "marble mod." I'm not buyin a whole damn bag of marbles when i only need one lol. Someone out there wanna donate a marble???
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