Does anyone know if there is a 6.9/7.3 exhaust manifold set that is either a center dump or symmetrical for the left and right? I want to flip them and weld a t3 flange on them and run twins into a single on a 6.9.

 

Check with some of the speed shops they can steer you in the right direction. You also may want to look for a custom exhaust shop. I did find one in your area The Muffler Shop II 1334 Fairport Road Fairport NY, 14450 (585) 377-5610. On line ad say they can do Custom work, even say they can handle big trucks!