Souk, I think that you need to specify which supplier you are considering the group buy with, then I would know whether to join in. I have been planning my CTR replica for over a year, really since the first time I saw Bill V.'s car on this BBS, and have researched sources and prices pretty thouroughly. The normal prices range from genuine RUF @ ~$1600.00 each, to BW motorsports, (Bill's suplier), @ ~$1000 a set, to Rennsport in CA. @ ~$700 a set. I have not bothered w/ M.A. Shaw or the others, they probably fall somewhere in there. They are definitely
not all created equal, some I am not interested in, so the aforementioned info would be relevent to me, and probably others.
John Rice pretty much covered the aerodynamic issue; yes, small aero touches make a HUGE difference at 180-200 mph, zero difference at 100mph, (or close to zero). Aero drag is not a linear equation, if not mistaken. (But I could be).
I have a second cousin whom I barely know, Steve Beddor, who is I think the biggest RUF customer in the U.S. He had at least two CTRs, one AWD, (based on C4), and one RWD, I think. He is a respected club racer and I saw one of his CTRs advertised for sale a couple of years ago for what I thought was pretty reasonable, under $100k if memory serves. The pic on this thread of a 993 RUF car w/ MN. plates is definitely one of their cars.