This is only semi-relavant, as I'm not familiar with the Crovair muffler in quesiton, but here is THE BEST exhaust article I have read:
EXHAUST TEST
It found that the DynoMax mufflers performed the best overall, which is good, as we have been running DynoMax products on all of our cars, and are fixing to add another to the Camaro. In fact, DynoMax mufflers are recommended by Bob/Dan at the Pure Stock races. I think CopoPete has a DynoMax transverse on his white COPO (that runs low 12s!)...he seems to like it, and I can honestly say it sounds AWESOME!
