I have been to K1 Irvine and Dromo 1 in Orange. Both are a blast. I think K1 might be a little faster, but Dromo carts have more feel to them. You can feel the throttle, not just on or off like the electric carts. There's also a place off the 405, I wanna say around Carson but not sure. Its on the right going north bound kinda by where the Goodyear Blimp is parked. I heard they have multiple tracks and multi-story tracks. I have not been there myself. Anyone have any experience with this place?