muffler backfires with irritating sound...

is it a poping sound or a backfire sound this is backfiring and its my 240 http://www.facebook.com/photo.php?v=2365700054470

backfire like a loud spitting sound in high speeds...

what do i need to change? is it possible something's wrong like pipes are too big or something's loose? i really hate that sound, it's like "sssprrrrraaang!!!" or something like that, it happens during top rev before i shift... when it's idle, it sounds fine and when i step on the gas its not that loud at all..and there arent even any flames coming out even though it sounds like it...

is it happening right when you let off the gas basically? if so its the lack of restriciton without a proper tune. youre engine is cutting fuel delivery when you back off the pedal to quickly and youre hearing it. you need to adjust the dfco table to compensate

how do i adjust it? this happens only on higher rpms and when i downshift to accelerate more...

dfco? does this have something to do with downshifting often? i have AT transmission?

maybe put your catalytic converter back in and it will stop.. or get a standard

i still have my cat... i just pulled out the resonator...

i guess there's something wrong with a 2" diameter catback piping and aftermarket header? i didnt find anything wrong though...

the only way to adjust is it with some sort of tuning program.

this is how it sounds during idle... but when im driving, there is a sort of loud sputtering... a little louder than the sound of stepping on the gas during idle... http://www.facebook.com/photo.php?v=397542996926523