Garden variety “turbo” mufflers will hinder power, Jim Hand showed that years ago…recently the Steves and Dave showed it on an episode of engine masters.
The turbo muffler’s appeal is sound, with performance taking a bit of a hit.
Dynomax super turbos are a different breed, they have flow directors, and as such kinda sorta a little bit act like straight through mufflers. The 17749 that you’re looking at did really really well in Jim Hand’s testing.
Walker/Dynomax also makes a traditional style turbo muffler, I believe it’s under the Dynomax banner, but not referred to as a Super Turbo. The number escapes me.
Aside from the functional internal differences, its case is an inch or so narrower than the 17749/47, which could benefit A body owners with big rear control arm braces. * shrug *
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costs too much
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