Quiet muffler choices

Thanks for the link Auto Exhaust Science. The Walker 21856 are spec'd for 500ci Caddy that is one the main reasons I considering it.

The possible drone with the Super Turbos my main concern with them.

I will ad the Walker 18230 to the list.

The 372 I built is "mild". Eddy heads, ld340 manifold, 625 Street Avenger carb, a cam from Racer Brown .450 lift int/ex adv duration 264. Gearing for the rear axle is 3.00 9" Furd, and 26" tires. From what I have read the 19" case length is max that will fit. The Dynomax/Walker replacement muffler 18339 is 19" long and has the right offsets.

I live on the northern end of the Olympic peninsula in Washington. Thanks, a long ways away.

This article is what has me the most interested in the Super Turbos.
Exhaust (pontiacstreetperformance.com)