Muffler Advice

Thanks russhal that's a pretty good deal!
And thanks 6pk2goDemon, I was kind of
hoping VOETOM might see this and chime in.

If my math is right a 2 1/2" pipe flows about 500 cfm, no
matter the length and the muffler should be capable of
flowing in that neighborhood, it looks like the
whole system would be fairly quiet and able to keep
the exhaust pulses/waves moving along efficiently if
the muffler is not too big and turbulent or too small
and restrictive.