Can the procede v2 work on different cars or does it only work on the car that you first install it on. Also when does the v3 version come out and what gains does it have over the v2?

procede v3 has about the same power i believe but it is a plug and play piggyback

I'm sure you can swap it between different 335s (have seen a few on eBay).

I've seen the dyno sheets, but I was wondering how people liked this in the long run... Any issues?

Yeah cause Im trying to find a used one cause I don't have the money for a new one

You can put it in any car with the N54 motor. The V3 upgrade controls boost better and offers a few other features. There are many used V2 for sale on e90post.com. I've had Procede since the V1 and have been very happy with it.