I wouldn't try and re invent the wheel. Go with something that has been proven in the USA.
If you want bang for buck go with the CorkSport Exhaust System. It's been proven, easy to install and it's pretty damm cheap. Buy it here
Get it @ MPS Garage, alternativley if you want the CPE on they can source it aswell. Buy it here
I believe they have all MPS3 gear in stock @ the moment, might have to check it though..
CorkSport FMIC with Cold Air Induction, , Cork Sport Cat Back, CPE Standback with PNP, TurboSmart BOV, Custom Highflow Cat with CorkSports Downpipe,Pauter Rods, CP Pistons,ARP Head Studs, BIGGER TURBO COMING, Pre-ordered a Stage 3 CPE Engine.