S4 B5 600-700HP build, Need help!!
 

Hey guys, so I've just picked up an 2001 Audi S4 B5 for dirt cheap, it has a few problems, blue smoke coming out of the exhaust, thinking its the turbos, seals or possibly the pcv valve, anyways what turbo kits do you suggest for a 600-750hp range, also along with internals and who to order from, thanks for your help!!