The famous Twin Mill was first brought to SEMA in 2000, and on the way there, was unloaded in Vegas, under the company instructions to NOT drive it on city streets.
They only saw a couple cops who didn't mind, or, were so damn impressed they didn't care. 1100 Hp and two engines in such a famous car can have that effect when you're in Vegas during SEMA. (story gets a little more in depth at http://www.hotrod.com/articles/0307sr-milestone-twin-mill )
Also, the fine during SEMA for firing up a car in the convention center is 100,000 dollars per noisy engine operation.
It was only done 7 times. 4 times just for the fire marshall, who was that impressed and amazed.
