This is a Porsche 959! 

It's in Houston being certified for US emissions.  The rear end is off the car because they are fitting it with catalytic converters to pass emissions testing.  Very cool car.  The suspension raises and lowers with a switch on the console in just a few seconds.  The sound of the turbos as it drove down the parking lot was awesome.  Check out the front brake rotors (row 3, pic 3)... this car has been used a few times. : )