well I installed mac mids.. with there ORY with a bullet muffler at the end..

its loud as fawk.. but actually sounds pretty good..

but its running like ass.. its hesitating below 2k.. horrible backfire if I try to load the throttle in a higher gear.. like say if I'm at like 1600rpm in 5th gear and I give it like a 1/3 throttle it will stumble/hesitate and pop horribly..


the Y pipe is banging a little bit too..

can somebody give me any ideas on how to get the car running good?