BDRcobra
I too hated the backfiring, I ordered the side pipe flanges from
www.cobraaccessories.com and welded the flanges on. It took about 4-5 hour to install the flanges. We made the gaskets ourselves, though I see cobra accessories now carries the gaskets. We welded the flanges on the out side as best we could and the inside all around. I was suprised how much noise came for the slip joint. The sidepipes sound sweeeeeet now.
Brad