I noticed when my Cayman goes over 100mph (not that I would drive that fast, it just does it by itself) I hear a loud turbulence-like sound coming from the back. It seems like it's made by the spoiler hitting wind at high speed. Has ayone else noticed this or have an explanation?

 

I've heard that it goes away the faster you drive... so let that the car drive itself a little faster... you may want to ask over at caymanclub.net