Originally Posted by djb383
I thought a backfire was "backwards" thru the intake....no?
no need to be a smartass its a real thing. with 2k post i'm surprised you've never heard of such a thing.i think this is the culprit, especially if his problem started after he cut the exhaust. i'm not going to take the time to explain how the a backfire from lack of exhaust works but the OP said it back fires when he lets off the gas also indicating lack of back pressure.
your problem could also be from to much air getting sucked in (new intake maybe?), bad timing (which is rare) or its running to rich when you get on the gas.
i think your problem is from the exhaust though.