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  1. Rockrtx

    Muffler gutted but...

    Need some help to find a solution, i gutted the header and the muffler at the end of summer last year, remove AIS and put block off plate, ad PC5, BMC air filter and 16t front sprocket. the bike run great but when i pass 9000 rpm it backfire on decel ( large pow! ) and i can't stand it and need...
    • Rockrtx
    • Thread
    • backfire gutted muffler pow solution
    • Replies: 5
    • Forum: Gen II Mods
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