Tornado at Adventureland in Iowa. Simply amazing in the backseat. No gentle slope into the drop, no slowing down at the top of the lift. Just pure ejector air in the back seat. The drop is very steep and fast. Take a look at rcdb.com or something... you'll see.
In addition, the Outlaw, (picture in my avatar,) at the same place has an amazing drop in the backseat also. But, this time you get ejector air while flying down a GCI-type drop, but has a B&M-type dip n' drop concept.