I'm relatively new to the BMW world. I'm in the market for an E36 3-series. I'm looking at either a 323is, a 325is, or a 328is. I would like the car to have about 50,000 miles on it. A 328is is what I want, but its hard to find one with under 50,000 miles on it for a cheap price. So, if I can't find one of those, I'll look for a 323is or a 325is. From what I understand, the 323is can outrun the 325is, if it has been reprogrammed to an obd-1. What does that stand for and how much would that cost? I've seen a CPU board that supposedly does the job. Is there any such thing for a 325is to make it almost equal (in hp/torque) to a 328is?