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Seriously? How can a Dynomax ultra-flow flow nearly 2x a magnaflow, they are both straight through mufflers with packing material around the perforated pipe.

I have Magnaflow stainless, with an X pipe. Switched to them from Flowtech afterburners ("Summit welded muffler"). There is no more drone inside and it sounds great, certainly not quiet either.

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I dunno; perhaps there are more than one design of Magnaflows? not my data.

All I DO know is that I'd never use a Flowmaster when the Ultraflows flow twice as well AND are quieter.

Dave