Quote:
Originally Posted by 70GS455
I'm not sure about the Ultraflow, but on their Super Turbo, the 3" necks down to 2.5" internally on the smaller (4.75 x 9.5) case. The ST have 2 case sizes and the larger 5.5 x 11 case maintains 3" throughout
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I had the Super Turbos (Dynomax) that necked down inside on mine until they came out with a stainless steel muffler that was 3" all the way through. Unfortunately I think they discontinued it. It was P/N 17774.