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I'll give you the numbers to compare. A set of dual 2 1/2 pipes have a combined surface area of 9.8175 inches, while a single 3 inch pipe has a surface area of 7.0686 inches. Thats quite a bit of difference.



I think you mean cross sectional area not surface area. Those duals have a ton more surface area in the pipes to create friction witch resists flow. Also because the cross section is so much higher in the duals it loses velocity. If you had two exhaust systems of equal cross section then the single would make more power. The single would also be more balanced and scavenge better, sort of like an X pipe but it don't seperate back appart. A single exhaust with an equal cross section will have more velocity, flow and HP. Your examples are not equal though.

I am not causing global warming, I am just trying to hold off a impending Ice Age!