We just debuted the Sadev gearbox last weekend at the Fall Sprints at Blackhawk. It performed flawlessly (although to be honest, the Elite in the other car did as well). Top speed was virtually identical on the long straight. The times he ran were very similar to the times he ran at an August tire test. When asked how the gearbox worked, he just had a big grin. That was a huge difference from the old box. The installation was very straightforward and easy to do. I did a "manual" for the swap if anyone is interested.