FUNFER2,
I am going through the same decision for my KC Yates 373 SBF which has similar hp to your engine, peaks on the dyno at around 7000rpm. I have a real nice merge collector which necks down to 3" and then back up to 3.5" I was intending on 3" perf tube stainless packed mufflers, which should be big enough I guess the only way is to find out on the dyno buts thats a hassle!
Apparently grouping several 4-5 small perforated tubes inside the main perf tube quietens them down significantly, so 3.5" main tube should work good but it may mean going to a 4.5" muffler case,to get a reasonable amount of stainless packing and space.
Quote:
Originally Posted by 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 ?
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