[400TT]

Wow, another Holden V6 Cobra. Had a Harrison built up here with the earlier V6 Holden engine.

Personally I would go see a few exhaust shops. Just not going to be the experience here. I would expect cat, resonator & good muffler would do the job well.

If you are on a budget, I would just get the exhaust made out of mild steel. Get it painted and it will be fine. A nice upgrade would be to ceramic coat the headers. Little benefit in ceramic coating the rest of the system. Just make sure you put some insulation between cat and floor etc, those cats generate a fair amount of heat. Seen more than a few Cobra's with smoking carpet from cats.

Would love to see some pictures and hear how it progresses.