This car has a drive by wire throttle, there's a little electric motor controlling the throttle valve, when you slam on the gas it goes to open as fast as it can hitting a mechanical stop, that's the clicking.
There's a thread on this exact topic further down, here's Dezoris' response, a logged track day with zero knock and the clicking clearly audible.
http://www.ft86club.com/forums/showp...20&postcount=3