I've been doing some searching but havn't found any specifics on the tranny. If I were to put a 5spd in a 525it, which ones work? If I do a s50 swap, do I need an M3 tranny or is it the same as the one that bolts to the m50?

Is the S50 swap worth it? vf-engineering sells a M50 s/c kit that claims 300hp from the M50. The same charger on the s50 makes 350hp. Hmmm...