I have the traditional flowmaster 2 1/2” kit on my stock 70 LeMans and 69 GTO both with manifolds and I am extremely happy with the sound.
I bought both kits from summit.
I had the 70 LeMans kit installed, I installed the one on the 69 GTO. Easy to do yourself. If you aren’t running headers then you probably need to buy 2 1/2” down pipes. I bought them from summit as well (Pypes brand). Just trim to fit.
I found it well worth the extra $60 to buy the 2 1/2” x 3” band clamps if you aren’t welding. It made for a secure connection especially where you trim the down pipe.
I believe 72 had the exhaust below the quarter- like a 77+ Trans Am.
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