Well after searching for parts online I've concluded 2 things.
1. I wont be using PVC. Replacement parts aren't too bad.
2. There is A LOT of restriction on these systems.
The risers and fiberglass silencers have a ****-ton of exhaust flow obstacles and deflections. Wish I could get a decent pic for show and tell. One would think there is a fair amount of performance enhancement there. I'm wondering tho..what kind of back pressure, if any is needed?