Hi I've just bought a standard 1997 (P-reg) Golf VR6. It's done 70k miles. As standard I believe it has around 174bhp. Please can anyone tell me what modifications are available for my engine, what kind of power gains for each and approx costs for a good company to supply and fit? I understand fitting a performance exhaust and air filter won't make a big difference to power as the standard one is quite good already. Although I was thinking about fitting a cat-back magnex exhaust mainly to make my car sound better and the current standard one is getting rusty. Is magnex a good make to go f