Slant6

Perseus said

The teensy weensy little bit I know, so far, is that a single 2.5" exhaust with a Y pipe functions better for a slant because the hot exhaust expedites faster out the tailpipe without "bogging" it down. The cooler air in a dual exhaust impedes the flow somewhat and it exits in a pulse-like manner instead of a steady continuous flow.

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Engineers {Pete Hagenbush, creator of Super 6).." I wanted in the worst kind of way to have a twin exhaust system because, man, will that do wonders for a six. You put one, two and three, and four, five and six together and you run ’em down about 6 or 8 feet and bring them together in one tailpipe and you’ve added great huge gobs of output.." So Duals would be a great idea if you could manage them.