I installed the American Thunder Flowmaster kit on my 70 GTO. I did the 2 1/2 inch. Just about as easy as can be to install on headers. I had my brother-in-law weld it up, but could be done with clamps. Sounds great not too loud, but loud when you romp on it. I put 2 1/2 to 2 1/4 reducer on tailpipes and installed the original chrome splitters. I have the Hooker Super Comps, coated.
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GoatDr
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