i drive a 1994 325i, same old m50 motor 5spd blah blah blah, in anycase i was wondering if the cams out of the 95 m3(S50 motor i believe or s52) fit the m50 motor. or any parts that would up my power a bit, like intake manifold or throttle body. but the thing that worries me if the are changeable im pretty sure the 95 is running obd2 and im obd1...
so any info would be greatly appreciated.

The cams can be swapped, the intake manifold was identical on the 92 325i and 95 M3 but the 93-95 325i might be a bit more restrictive for vanos. The 95 M3's are OBD-1. You can do the exhaust manifolds and use 96-99 M3 exhaust but that weighs a lot, but less restrictive.