if he has an m3 e30 it shuoldnt be a tuff fit at all. im getting the turbo through my mom. but if you look on ebay they sell direct bolt on turbo kits for e30's, it does fit direct bolt on lie they say, my mom installed one at her shop and they had to modify it a bit to get it to fit, but it worked. holset and turbotechnics (sp) make good turbos.