Yeah, I keep an eye on charlie but didn't know about gravity stunts, thanks for the info.
There are a bunch of Sydney ppl who go on trips to Wollongong and the blue mtns during the week, i wish i had the time to join them but i'm frikkin busy with stuff.
Can't wait to try that carpark again. Definitely the best i've ever been in!
edit: pic from google:
Doesn't look like it, but it's sloped. It goes down two levels with each revolution of the spiral.