The last time I got information on the dauer cars, there was 1 for sale and 1 which Joseph himself was running as a 'day to day' car. His car had around 700bhp and spat three foot flames on the over-run.
Dauer has a web page with info on the SS and the 962 LM street car's... but I can't seem to find it via google or my large bookmark list. Although I could probably find it easier if I was sober.
I think its biggest problem was being to 'quiet' a supercar. Much like the F1, many people just don't see the beauty in understated hypercars. I, otoh, freaking love it to death. One of the best, bar none.