Howdy,
QUOTE (35th_Anniversary_AS_Camaro_SS @ May 21 2006, 09:34 PM)

and this BMW is free for me, so the only real cost is shocks, springs, bars, brakes & tires.
then I need to look carefully at BMW's contingency program
FWIW, the "free" Mustang I got back in 2000 for CP has cost me $18k and currently doesn't move under its own power.
That's $18k in parts only mind you, and doesn't include the parts I had for a while and sold.
Prepping a car (and I suspect particularly a BMW) for reliable track duty is going to cost some reasonable money (figure $2k for a cage/seat... And that's assuming you can do the cage yourself). Then safety gear for the driver is in the $2k range as well (Hans, drivers suit, helmet, gloves, boots, etc.).
BMW motors that I've had experience with are _not_ cheap to build and that's assuming you're just trying to build a reliable stock motor, not some crazy supercharged thing.
Suspension parts for a bmw seem to cost more than most anything else I've played with, both stock and aftermarket.
Don't get me wrong, if you can afford it and want to do it... Go for it! But the "This should be cheap fun" vibe I'm getting has _never_ worked in my experience.
Mark