[G.R.]

I've experienced the same thing, replaced my exhaust header gaskets(they are not leaking) and the header to exhaust pipe gaskets. Things were fine for awhile, then the backfire started again, turned out that it was from the header/pipe fitting, again, same side, blew out the gasket, replaced it once again.

It is slowly starting to leak again, sort of pops, especially when backing down. I'm sure it'll start the "k-pow" again in a short time.

I wish I had an answer but I've tried darn near every header gasket and combination, maybe my old pipes/connectors are just getting worn out.