coffmans

I’m gonna run a Coffman rocket pipe and the twin Mikuni 40i’s on the winter build, should I run the carbs as is with some screwdriver tuning? Or would it be better to have them jetted specifically for the pipe. If so, does anybody know the jetting and other carburetor settings required?

I just picked up a 750 SXi that has a Coffman's pipe that has the small stinger/silencer in place of a water box. One of the previous owners stuck a bolt and what looks to be a piece of rubber belting in the mount at the exhaust manifold and it has no other mounting points or straps holding it...