You can install what ever mods you would like.............ride and see if you need one or not. I am riding a cobra slip-on and an opened air box and runs great. Lots of good info on post listed above.
My dealer has said he has never had a bike come into the shop from problems not having a tuner with both mods.
JMHO
ive been runing mine for a little over a month now with cobra powrflow and home made slipon muffler no programmer and the bike runs great just as good if not a little better than befor i would like to get a programer just to see if it runs even better but that will have to wait for funds
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Yamaha Star Stryker
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