Post Master General
Join Date: Apr 2012
Location: Bowling Green, VA
I Ride: '09 ZX6R
The cats are actually in the headers.... removing the resonator box, and replacing the muffler doesn't do anything to the cat.
As long as the cats are in place, a remap isn't really necessary, although it will smooth power delivery and gain you a couple of HP.
The preferred method is to get a professional to adjust the mapping, on a dynamometer with a gas analyzer. Buying a power commander with the O2 sensor is almost as good.
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