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According to C&D

For street use, the GT1000TT wears a set of fat Pirellis—front 255/30ZR-20 P Zeros and rear 335/25ZR-22 P Zero Scorpions. For the speed runs, Heffner bolted on a set of sticky Hoosier A6 autocross tires—245/40ZR-18 in front, 315/40ZR-19 at the rear. With drag racer Gary Javo from Savannah, Georgia, at the helm, the GT clocked the quarter-mile in 10.6 seconds at 152 mph and hit 200 mph in 18.9 seconds.


Combined with a set of Ford Racing brake rotors, the Hoosiers also paid off in the test’s shortest stop: 200 to 0 in 1089 feet, which in turn added up to the best 0-to-200-to-0 result: 4642 feet in 26.5 seconds.

Considering its face-distorting thrust, the Heffner GT is remarkably docile on the street. A set of Eibach springs and Penske adjustable shocks raise the roll stiffness, but the ride quality is civilized nonetheless, the clutch is agreeable, and drivability is of the everyday variety. Owner Ray Hoffman, a Texan who had barely taken delivery of the finished car by test time, called it "a sweetheart."