Marshall, I doubt that they were chipped.

A "chipped" turbo like mine + exhaust will put down about 430-450awhp and 480-500awtq @ 16psi to give you an idea. That's about 70whp and 100wtq from the chip alone. A chip really wakes these cars up. My buddy ran 11.6 @ 123mph with just chip and exhaust in his '01 turbo automatic.

An '02+ Z06 and an '01+ 911 turbo will run neck and neck, stock for stock. Once you start modding, things begin to differ as do all cars.