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It's the lack of cat that enables flame shooting, with the degree of flame shooting based somewhat on your cat-back and fuel trims. If you run really rich, that will increase flaming, lean will reduce it, a big can muffler could have it lighting off farther up the pipe and less getting out. I.E, with the stock muffler and the above BHR midpipe, I would have ignition of excess gas inside the stock muffler, which is only visible as reflected light if you happen to be looking right down the tailpipes.
A few other small variables, but removing your cat is the best method to ensure flames of any type.
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8/2010 - Proud Owner of a 1988 RX7 Convertible N/A Red All Originial- .
9/2005 - Proud Owner of a 2004 RX8 GT+Navi, Winning Blue Blown & Being Rebuilt