If I remember right it they have cast pistons and only put out around 220 horse at the fly wheel. I have some inexpensive parts sitting around that can make it a 10 second motor with some spray.
This is getting to drawn out. I personally know of another black tt Z06 here in Columbus that was built a year before the Doc's. I know this because I have worked on it. If it is the same car it had a stock engine. The owner didn't want to pony up the cash for a new engine.
/thread