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I was wondering the same thing...I recently changed the pipes on my Nightster from stock to Screamin' Eagle black ceramics with midnight gray wrap on the header pipes. I didn't do anything with the EFI system, and the bike runs fine. I'm going to put on a SE Stage 1 air filter with the download at the end of this month (when my bonus check hits the bank!) and am wondering if this is all I need do, or should I start looking at a Power Commander or something like that?
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