New memeber
looking for info. just installed leo vince high mount exhaust, now at around 4000rpm motor starts to back fire and stumble a little, not yet jetted or the tps sensor reset. sounds like the motor is lean, have a track day 7/1 and no time to rejet before then,thought about raising the needles to see if it would get me through the track day. stock exhaust pegs dragg badly so i need a fix for this asap. any help would be great. thanks