Hey guys.. A few weeks ago I was fooling around with my friend and hit redline. My car then, a few minutes later when it was idling, started to blow white smoke out of the exhaust pretty badly, I drove it home, and then it stopped. A few days ago it began to blow a little bit of white smoke, but after revving it, it went away. I told my mechanic, and we checked it for a head gasket by checking for hydrocarbons in the coolant over flow, the test came up clean. What is my worst case scenario? New turbo? ALL SUGGESTIONS WELCOMED!!