WOW...That's an explosion....You may have also damaged it on the chassis dyno if the operator locked the brake up, etc...Just a thought since ya'll just finished a tuning session not too far back! I'm glad that didn't happen at speed at the Rock coming up...Glad your ok, sorry about the car. Step away from it for a bit and run the piss out of the Z-car, that's what they're made for. Take care, Chris