I´ve recently installed a max tourque down pipe and my bike only reaches at 58mph so I swapped the old exhaust back and my speed goes back to normal at around 60-70mph on a strait with the max tourque exhaust it wont go past 8000rpm and as soon as I go into gear 4/5 it drops power and with go any faster than 58mph as stated above I swapped my old exhaust back and no problems I´ve tried premium copper silicone to try fix the problem some said to me that my gasket might be the problem Inside the silencer so I´ve ordered a new one to hope that this will be the problem resolved but any other things that might be the problem I would really appreciate what people could recommend me that you