Hi again Richard.
Sorry for the delay in replying. Here in WA, once the car is road registered it is the same as in the UK - I can do what the hell I like! However, there are some "jobsworth" traffic cops who can "yellow sticker" any car they believe needs an inspection due to being modded. For example, the front strut bar was considered a mod during one of the inspections! I had to remove it otherwise I would have needed an engineering cert for it! Obviously, I put it straight back on after the inspection I am thinking about a brake upgrade though but it must fit inside my present 17 inch wheels.
Anyways - you said you have probably 400ish HP? I am still wondering about mine - I'm thinking it must be Stage 1 as just looking into the engine bay it has a 3 inch Scorpion exhaust, green injectors, Turbo Technics 10623 turbo, Piper Cams and interestingly, an extra multi connector for the distributor side connection. The rocker cover is BLACK - is it true that certain tuners painted the covers as a sign of their work?
The car goes ballistic at 3600 revs which is great Up to that point it is a boggo 2.0 litre from the 80s! I will have a look in the ECU for a newer chip when I get the chance.
Cheers