That is the problem I am having I matched matched my exhaust port size to the pipes. Do you think going a little smaller would help the shock wave or try different diffuser methods/ stingers
I ordered a set of slp twins from the 10 dragon H.O. for $200 they pretty much fit rite in my 2018 axys followed the instructions from the outlaw 850 pipes... but now fighting the tuning.
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