Hoosier.
Compare the same muffler (and same number)
F-body style Ultraflow SS: 573cfm
F-body style Super Turbo: 385cfm
The ultraflow (straight through design) flows 49% more air. That's a significant increase even on this poor muffler design!
17281 (UF): 700cfm
17730 (ST): 260cfm
That's a 169% increase for comparable SVT style mufflers.
(Though neither are not bolt in. The body is much longer! The SVT uses tiny 10" mufflers)
We won't even throw in the Welded series which outflows the SS series & is cheaper to boot!
