Just purchased myself a 1990 525i which has an oil leak from the bell-housing (getting checked out on tuesday), and the exhaust is completly rusted and requires replacing. Rather than just buying standard parts, I thought it'd be good to do something diffent - ie. turbo.

I was thinking of getting manifold, dump pipe, and exhaust custom made though i have no idea what this will cost??

Ideas and suggestions of the best way to tackle this project would be greatly appreciated .