I have a video of a Slash on our track from this year.
http://www.youtube.com/watch?v=5tvJ2zDRPg0
Doesn't give a good impression of the speed. Also the track wasn't that fast in that lay-out.
I've seen the 5.5 pull wheelies on the new straight in the slash.
'
Here's a movie of one with a 5,5
http://www.youtube.com/watch?v=9UcoAd30T5I