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I'd go for a 2" system on a mild B18 or B20. I would run the pipe under the axle to minimize restrictive bends. I would use a straight-through type muffler (sound absorbtion type like a Borla or Magnaflow, NOT sound cancellation like Flowmaster), and put it as far back as possible -- behind the axle next to the gas tank, if there's room. That will be the quietest and also the least restrictive place.
I have a ~200 HP B20 and I'm using a 3" system on that, with the same layout.
IMHO, Supertrapp is a concept that doesn't work.
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