Cut away of a Dyno Max muffler #18381

'63GT said
I'm assuming it is for the Dynomax muff you quoted.. I just wanted to help out with the conversion from 10" pressure drop to 28"..

OH! Thanks! Totally missed that. Dang. The posted numbers were on the “Heart Throb” units.
Now we know! Thanks.

That’s a pretty healthy muffler then!