My '74 has a stock 302. The PO installed a dual exhaust with H pipe. When it was time to replace the exhaust, I had 2-1/2" single exhaust installed with a Dynomax ultra flow muffler. The muffler tucks up nice. It looks stock it sounds perfect, to me. A nice idle growl, not loud and I can have a conversation while driving.
The single exhaust also improved my low end torque.
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