Yeah curves suit the curves of the bike for sure.
My old Freedom Performance curved (Slash) system used to drag the lower pipe on the road through fast right handers to the point of starting to lift the rear wheel!
It did wear down some and was kind of dangerous fun.
The better flowing RPW system has more performance, better sound, and burns my leg if Im not careful.
In the words of Meatloaf...Two out of Three Aint Bad