Hi I am new on here and new to Harley. Bought a 2009 street glide with arlen ness big sucker a/c with oem cover and Samson rolled thunder slip on exhaust. I don't see a tuner on it but found o2 optimizers still on it that I think come with Power Commander tuner. Bought the bike last fall here in Canada but it came from the USA. Tried it with the o2 sensors plugged in and with the o2 optimizers and can't see much difference in plug color, both seem a little light and are on the whitish side. Bike works great but has some decell pop. Not sure on anything else like HD stage one ecm flash. Anyway after all my research can't decide if I should tune or not. Hope you guys can help me make up my mine. Thanks Lyle