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This^^^^ You are bolting the exhaust system to the seat belt anchor plate. Need to get the proper mount from year one that mirrors the right side of the car. 1966-74 A B E-Body Muffler Support Bracket 1967 1974 A B... (yearone.com) ....here you go, TTI has them for $32! Accessories (ttiexhaust.com)

Nice! I have a TTI 2.5” exhaust with h-pipe and Dynomax mufflers on my road runner and the drone is unbearable at cruising speeds..... gonna try some vibrant resonators before the tips and see if that helps. Harmonics are crazy things.

Can you loosen the three bolts at the bottom of the column mount and cheat the column away from the headers a bit?

Umm, you may be interested in watching the Enginemaster video where Dulcich and Frieburger bash a set of headers on a dyno test engine with a hammer and back to back dyno pulls show no appreciative loss of power. If the theory of more flow equals more power was actually true, we’d all be running...