lysholm are too loud for my liking, sounds cool but i couldnt drive it every day, maybe as a track car which was its owners purpose was.
Here is a G40 with an air raid siren:
http://www.youtube.com/watch?v=epw1EZatQ2QBeleive this to be phil j's old car.
And this with an air box (not quieter at all)
http://www.youtube.com/watch?v=JBUN3c8D3SsAnd this is a good one for the sound whilst driving in a built up area, G60 rado though.
http://www.youtube.com/watch?v=dxhDLMrlL4QThe bracket that is on the car is also custom made.
Sam, you would need a new set of pulleys, charger bracket, charger, outlet elbow, pipe work and then air filter pipe work.
Oh and blanking plate or boost return pipework. I think the injectors are G60? Check if they are green.
Keep the standalone oil system you have though, thats worth keeping.
If you want a set of standard pulleys i got them you can have as they are of no use to me, but if you want PSD toothed ones expect to pay around £200 mark, although some recently went for a lot less.
Charger will cost anywhere between £250-£500 ported or standard. Outlet elbow a few £ and pipe work slightly more cause you got a front mount.
You can sell the charger setup for over £1000, or swap it for someone with what you need plus cash your way. Or sell it and get a G45 charger.