The drive shaft broke, taking out the differential, axles, and cracking the transmission case. Also took out the exhaust. Violent wheel hop, sticky tires and well prepped track. The car makes 742rwhp, the Master Tech said I dont need to beef up the trans - the stock one is fine. All the hardware has been beefed up. As it turned out, he's going to swap the original valve body from my tans into the replacement. He thinks it was an incompatibility issue with the ecu. Since he works for CDJR dealership, I'm confident he's correct.