1970 318 duster exhaust question???

Well, 2-1/4 isn't that big of a difference to 2-1/2 to make me have an exhaust shop try and duplicate the amazing quality of TTI 2-1/2. I guess I'll deal with any loss from the step up to get the quality of the system and hangers etc.... Also I am running the stock manifolds so there will be some restriction anyway and "backpressure" from that to make it not so crazy.