RUF is a German company. Check out the "Yellow Bird" 911 CTR, which in its day (late 80's i think) annihilated the Old Nurburgring... The video of the RUF test driver (Stefan something or other) driving Yellow Bird around the 'Ring can be bought over the net and in some stores im sure.... It's supposed to be quite unbelievable
heres one link.. there are many sites devoted to RUF and yellow bird, and the ruf site itself is pretty cool
http://autozine.kyul.net/911/911_a13.htm
cheers,
jay