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This exhaust was created after the original single exhaust got too loud for San Diego because of adding a high flow cat (HFC).

The result of this is a sound level in the upper 80 dBA range.

Just search for "twin loop muffler" to find one of these on ebay or the web at large. There are a number of places that carry them in a form that closely resembles the original Mugen version.
The ebay page photodid not end up using the Insyneratortwin loop cat back completedtwin loop cat back completedtwin loop cat back completedtwin loop cat back completedtwin loop cat back completedtwin loop cat back during fabtwin loop cat back during fabtwin loop cat back during fabTwin loop muffler is filled with fiberglass, it's getting louder with useMinor losses with the muffler on vs turn downThe turn downIMG_2853