Internal exhaust flappers?
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#15
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I bought those same flappers from cp performance. Haven't used them yet. I have stock 88 brass tips and I had to have them machined down inside and outside to fit. I hope that they will be ok. I'm putting the motor back together and I bought a set of stainless marine manifolds and tailpipes. I hope it works. I didn't want the butterfly flaps since they fall apart so I figured I would try it. Do they restrict the exhaust flow that much?