Air box is £4k 2nd hand.....
All down to small amount built (like the RS500 Sierra), they were BMW at the peak of engineering and many people say that there will never be a BMW as good. They were £60k new (£17k more than a normal M3) and you could have any options for free and if you held a race licence they'd delimit the car for free as well (180 mph unlimited).
For an out if the box car I've never owned anything quite so good and I don't really know why I'm selling it.....
Steve