mines same as yours. I got 32,000 miles, thought it would be a shame to throw it out. But after all the research I've done I've realised it just aint worth the cash.
£4000? pah double that mate. engine build will not cost that much. it's gearbox, brakes, etc too.
You can spend that on a vr6 turbo and get 500whp but that is too much power. Will just spin and spin so why bother?
A TFSI engine is major work but can be done and you will have to part good money.
G60 is not worth it for that power, I wouldn't trust it lol
everything points to the 1.8 20v bam lump