[FUNFER2]

I'm researching side pipes & mufflers. I have questions regarding muffler selection. By best friend Chad is a professional mechanic with his own shop, has a Mustang chassis dyno and we race sprint cars together.

He believes the 3" from Classic Chambered is too small for a engine that KC will be building for me. It will be a Pond aluminum and Edelbrock stage 2 heads alum. heads., with apx. 630-650 HP. The only 3.5" muffler I've seen is the Howe, but the problem is excessive noise. I do like the cobra fairy loud but, I don't want to piss off neighbors, getting nasty looks from other drivers, and MY wife, not wanting to ride in it. lol

We figure the 3" may restrict the flow, with this much HP & TQ.
So, how do I determine the needed size muffler with HP/TQ ratings ?