I actually own a 2001 ZO6 and researched the TT before buying. Here are the numbers. They speak for themselves:
2001 ZO6: '97 SupraTT:
Price: $48,600 $41,000
Weight: 3115 lbs 3528 lbs
Engine: 385 bhp @ 6000 rpm 320 bhp @ 5600 rpm
385 lb-ft @ 4800 rpm 316 lb-ft @ 4000 rpm
0-60: 4.0 sec 4.8 sec
Top speed: 171 mph 158 mph (gov)
1/4 mile: 12.6 sec (114 mph) 13.4 sec (107 mph)
comparing stock cars, the ZO6 is lighter, has more horsepower and torque, handles better and is flat out faster than the turbo Supra.