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KILLSHOTS · 10-30-2015

There's an anti-backfire feature (forgot the actual technical term) that Marc enables on his PROMs when you install headers. When I had mine installed, I sent him my PROM for an update and when I got it back and installed it, it was backfiring so hard I thought it would blow the exhaust off. I contacted Marc and he checked his records and noticed that he had forgotten to enable this feature and he took care of it right away.

Short answer: contact Marc and order a PROM with anti-backfire enabled. Good luck.

10-30-2015	#5
KILLSHOTS Join Date: Feb 2014 Location: AZ Posts: 857	Re: loud backfire There's an anti-backfire feature (forgot the actual technical term) that Marc enables on his PROMs when you install headers. When I had mine installed, I sent him my PROM for an update and when I got it back and installed it, it was backfiring so hard I thought it would blow the exhaust off. I contacted Marc and he checked his records and noticed that he had forgotten to enable this feature and he took care of it right away. Short answer: contact Marc and order a PROM with anti-backfire enabled. Good luck.