Exhaust sounds?

Go to 2 1/2". Second best power producer on our old '73 Duster.
Well then I'll have to grind out the outlet on the manifold farther. (Doable I think)
2-1/4 is already 1/4" bigger than what was on there stock, I had figured that would be as good as it was gonna get w/o going to headers or dutra duals but I don't have an extra $600ish laying around right now to do either.