Shouldnt have to buy a tuner either for exhaust.
My buddy has a 2011 CVO RGU, and he put Rinehart full exhaust on, still uses the o2 sensors, doesnt have a tuner, and has not had it Dyno'd. He is consistently getting 42-45 MPG and the bike runs great. He has 16,000 miles on it since April, and has had no problems.
I think normal Dyno time is about 3 hours for a good tune.
'10 Red Custom:
check out my build thread for pix and mods
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