[tyler.klages]

Hey all I just put a new HMF Competition slipon on my 700xx. Sounds great, loud, but sometimes when I rev it, it back fires. Is this normal? And will back fires hurt anything? It came with three different baffles 1. somewhat restricted 2. less restricted 3. not restricted. Please Help thanks

 

[700xxx]

you might have an exhaust leak/and or need a tuner

 

[tbird88]

sounds like it is too lean to me so get a ehs programmer