I just got done throwing on my Vance and hines Cruzers duals. The problem is now as i accelerate, it sounds great until i pull in the cluch to shift it backfires real bad and loud!!! Also when i engine brake. I'm assuming that means i need to adjust the carbs or something but i'm not sure what to adjust. Maybe the jets? I'm on the Kentucky/tennessee border if that helps, i heard it has to do with the climate. I'm not sure, but i know i need help, cause it's not pretty anymore!!!! I'm in the military so i don't have time to search google for answers, that's why i came to the owners/pros! Thanks guys.