Jesus! Where did you find that! Sounds like an awsome car. The GT35 turbo's are good for 600+ ponies so it's safely mapped at 500 ;-)
I thought I had bought an RA with a similar set up (2.2 Jun engine etc) on eBay a few months back but the seller wouldn't honour the deal.
EDIT:
Opps, I see the thread's older than I thought. but still