Well it's certainly in the exhaust
And its only when I'm at WOT
The simplest way I had it explained to me is fuel making it down into the pipes because of too little backpressure which I guess equals backfire??
Being so I'm guessing the flowmasters aren't enough for this big engine and I'll have to swap them out for something else
Sob **********
Watch my fly bye vids u will hear it
Lemme know what u all think please
well, there's a hell of a lot of combustion going on inside the engine, where it's supposed to be....and a muffler is meant to "muffle" those sounds. if you're running no muffler or a race muffler, you're no longer muffling those sounds and you will hear them. based on the fact that the stock muffler isn't a source of restriction or back pressure i would challenge you to explain why you think a new muffler could cause fuel to enter the exhaust system.