[HP Autosport]

JRZ has a great motorsport products, but their street kits, although great riding and performs well on and off the track, do lack reliability. If you use your M2 more on the track than street, you can't go wrong with JRZ.

If you are looking for a dual purpose coilover kit with good installation instructions and less headaches, Ohlins R&T will likely give you the best street ride possible, often improving ride quality over OEM.

MCS and Moton are a couple of other good choices as well, but more for the track than street.