Just read an interesting article which road tested some very fast Porsches, one of which broke the lap record around the Nurburgring. The two they did a road test with were the RUF R Turbo and the Gemballa GTR600. RUF is classified as a manufacturer whereas Gemballa is a tuner. The GTR600 recently set a new lap record at Nurburgring of 7mins 32.5secs which was 17 secs quicker than Walter Rohrl in the 911 GT2!! The RUF has the highest top speed of any production car available at present and is being rewadied to break the record at the Nurburgring.
The specs for the cars are as follows:
RUF R Turbo
3600cc
520bhp
546lbs Torque
1530 kgs
345bhp/ton
0-60 3.7
Max 213mph
price 370K DM (171K USD)
Gemballa GTR600
3600cc
600bhp
479lbs Torque
1480 kgs
411bhp/ton
0-60 4.0 secs
Max 215mph
price T.B.C.