Well,tonight I put the original cat H-pipe back on,had a stock gutted one there before. Guess what! The power is back. It pulls a bunch harder,like before. Apparently,the computer pulls the timing back and or the exhaust flow is screwed up when flowing thru the empty cats. I guess if the '01 Cobra can make 320 HP thru them,they should be plenty good for the Bullitt.
Lesson Learned!
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