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Yeah well ive looked over the whole true duals thing.... and you would be better off keeping your stock header pipe and just putting on the slip ons .It will dyno out better as well. Check with any indy shop they will tell you the same thing for the 103 motor.Thi is not the case for the pre 09 bikes ( they have a different exhaust setup)
Lot's of variables in that one blacktopr. Without even going into a HP or overall flow discussion, here in FL the heat from the CAT(s) can be a killer all by itself.
It's worth it to get the Californistan crap off our scoots with virtually ANY after-market exhaust - maybe just gut the stock system. Heat is probably not as big of a problem where you are though.
My worst upgrade was progressive monotube shocks for front end.I bought them on e-bay and installed and soon as I hit the front brake they bottomed out.Contacted a rep and they would not do anything since i didnt buy from themor dealer.I threw them in trash where they belonged.
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