The"god-awful" wing came with the car, it was in the trunk and made the smaller DOT approved one taller by adding spacers, stock except you had to put it on. I believe that turned up exhaust is also stock.
From BMW World, "BMW placed several options in the trunk, which the user could install if desired. Why did they put them in the trunk? Because if BMW found out they were installed, it would void your warranty!
Designed for racing only, the performance options were:
An oil pan with a dual pickup. The dual pickup helped ensure constant oil flow in hard cornering.
A non-DOT spoiler to increase down force. The spoiler does have a penalty of a few mph at high speeds.
The spoiler included an upper GT Race wing with two spacers. The spacers could be used to raise the upper wing further into the air stream if desired, like in the above picture."