i'm thinking about doing an s52 swap on my 325is, i don't know enough to do this on my own so i'm looking for a reputable mechanic on long island to take on this task and tune my car properly. any suggestions?

I have used two shops before.. both were for my porsche 944, but they both work on bmw as well.

S M Motorsport in New Hyde Park
Sunny owns it, nice guy, good work, cheap labor too $68/hr or somethign around there

TKX Motorsport in Huntington Station
Formerly RPM Racing, I used them for a PPI ( i ended up passing on the car, but thats its own story ) and Taso (the owner) was very nice andhelpful

Those are 2 I have used, RPM Racing has since moved i believe to hicksville, they used to be the best for tuning any sort of sports car but I used them just to get parts before they seperated away from Taso

Hope it helps

if you really want a nice clean job go with azevedo motorsports. they are in NJ but not too far from NYC.