probably quite a lot of money to do it right. No 'kits' as far as I know, you'll basically have to piece it together yourself, or pay someone to do it.
Check out e30tech.com , tons of turbo e30s and info there...
+ 1 on TCD. He makes some good quality kits, and I really like his cast manifolds (quieter, quicker spool, longer life than tubular, although they limit max horsepower).
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