2.75" vs 3" pipe on supercharged vehicles.

Sh0velMan

I also should add that since you have the parasitic losses at the center of the pipe, running a single that has "mathematically lower" area doesn't necessarily mean it will flow less than a dual with a moderately larger mathematical area. For example a dual 3" vs a single 4".

I doubt in most setups you'd see a measurable power difference between them, all other things being equal and Y pipe/Merge collector design being optimal. I know several guys locally that run a 4" flattened pipe rather than 3" duals and they all indicate identical power response while saving significant weight.

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