RTABS is rear trailing arm bushings, mine are horrible. It makes the back end of the car feel like the tires are really low kind of and makes it sway as well as clunk sometimes. I still have yet to do them. I almost spun out in the rain on highway as well. Hell, even at a stop light in the rain when I hit the paint line I can feel it shift.

M50 is the right engine, I have a 93 325is. I loved it also for the first few weeks, but meh, after $430 for a wheel bearing, now a starter needs to be replaced, my optima yellow top all in one week. Shits pricey.

They are pretty though, lol.

Heres mine. I am in Palm Harbor.