ok..when my piping wasnt done yet my car was backfire which is suppose to happen, but when i got my piping done it still keep on backfireing or sound like it is ne way n its around the 5000 rpm range , im thinking its cuz i need bigger injector because im running a stock injector without the filter which push out more fuel n yes, i knoe thats ghetto or do i need a msd kit? you think ? well if ne one know what might be the problem it would really help me out. thankz in advance johnneeblaz

 

generally backfiring is cuased by leaning out i believe

you should get yeur car dyno'ed or atleast run it with a wideband to see what the hell is going on

nathan