Prochamber to H-pipe w/high flow cats

Hello all,

I'm moving from a city that doesn't test emmissions to one that does and I'm wanting to know if anyone has any suggestions of a good h-pipe w/high flow cats I can get. I'm currently running on a MAC system and I know MAC makes the h-pipe w/cats and I've been satisfied w/MAC pruducts thus far but I would like to get some more suggestions.

Also, what kind of sound difference can I expect?
 
I would just get a set of the catted legs for your Prochamber. That would be cheaper than a new H, and you will always have the offroad legs on hand to switch back to, if you so desire. That's the way I would have done it, if I was smart enough to get a Prochamber when I was looking for exhaust.