Guys,
Not sure about a rear bar, there are three that I have seen.
1) Made by SHO shop
2) In a magazine I ordered from Tuning Zubehor. Red Steel can't recall the price, they had matching front and rear.
3) Same magazine but in aluminum, they had matching front and rear.
You should really give them a call and order there magazine, especially if you have a BMW or Audi talk about mad parts!!!! Its like 550 color pages. Releatively cheap too.
Anyways not sure about the Aluminum vs Steel, I am pretty sure you will loose some weight but would only be compromised by stiffness. But I'm not sure to what degree.
Let me know if you need any more info.
Peace!!
