Although I agree with wdimagineer that BMW hasn't come anywhere close to realizing the full potential of this, I'm really tempted to do this. Doesn't look too hard after watching the videos and reading opasha's outstanding instructions.
When I follow the link, it gives me a price of about $1500 for the part. Is that correct? So it would cost me $1500 for the part and that's it if I install it myself?
Didn't think I would, but I am leaning closer to doing this.