How often does this do this and how long does your car idle before it starts? Do you run it hard before this as well?
I installed my exhaust last Friday and the next day I got smoke, and then again this morning..... 6 days later. I cant put a finger on what I do to cause it.... other than both times were after heavy boosting of 10-15 minute runs. I dont think the turbo is doing anything differently then it did. It does seem to be a design issue on the turbo.