My 06 Subuaru Legacy has a "dual" exhaust. In reality though it's the same as has already been mentioned, from the header to the cat it's a single pipe, then around midway it splits into two pipes. Functionally I can't see any reason why dual pipes would be more useful than a single pipe. Put it this way; you have a single header that runs down into a single pipe from the cat. Right away you're already limited by a single pipe. In V6 and V8 engines you typically have dual headers, so it makes more sense to have 2 exhaust pipes...
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smaller diameter pipe has a smaller cross section, like my idea for 5" or more pipe that has been made really oval instead of round to allow for large pipe and low car...any hoo...by having a smaller cross section wouldn't you thus have more drag from the sides of the pipe?
I'm thinking the pipe has drag right around the edge of the pipe, a little away from the pipe, and the least drag in the middle. A larger pipe has a larger cross section so only a little of the total gas flowing is experiencing drag...a smaller pipe has a smaller cross section so it would have more drag on the gas in relation to the total gas flowing.
so you would want a larger diameter, and as round as possible...
Yes no? That's what I'm thinking
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