First let me start by saying I own both cars, so I have no reason to make up any of this. The Z06 at the time had a Borla exhaust and diablo predator tune. The LP640 was and is all stock. From a dead stop it was almost an even race to 120mph. At a rolling start, be it 30, 45 or 60mph the LP640 would leave the Z06 like it was sitting still. Now let me close by stating this was all done on a closed private course and performed by or supervised by professional driver's.