If you really want turbo. I'd suggest building your own turbo kit with a ko3 or ko4 turbo off an Audi. Go to a machine shop and get a custom built exhaust manifold after you size everything out yourself. That way you can mount the turbo properly etc. The Ko3 and ko4 turbos are cheap and easy to find. You can honestly build yourself a turbo kit for about $2500 with ALL parts and labor NOT including the tune. The tune would probably cost about $500-1000 all in all. Not to bad but is it worth it?. That's what you have to ask yourself. And this is keeping the same compression on your engine so you'd only be able to do like 6psi safely with it unless you dropped the compression a bit.
BMW 2006 M5 - REALLY LOUD
Audi S4 2000 Stage 3 - Dat turbo spool
BMW 2000 3-series
Because race car SOLD
Maserati 2004 M128 GT
- HREs/tint/straight piped SOLD
BMW 2006 M3 - stock - SOLD