The RoadTest article claims this:
The blistering 10.32 run was made with a full weight ZL1, using its stock 1.9 liter blower and catalytic converters with a density altitude of well over 1000 feet. The ZL1′s mods include a Redline Motorsports proprietary camshaft, upper and lower pulleys, headers, improved heat exchanger, cold air intake, performance torque converter and Mickey Thompson drag radials. This bad ZL1 makes well over 750 horspepower and 700 ft-lbs of torque.
The sound of this car is just incredible from idle to WOT. Great numbers considering what has been done to this car for mods.
2012 Ford Mustang 5.0. Brembo, 3:73s
2012 SRT Challenger 392 auto 12:40s 112 stock
2010 SS, LS3, Cammed, LTs, 12:20s
2004 Redfire Cobra, Pullied & Tuned
1986 GT, Ed Curtis 347ci, 11:20s motor. 10:30s 100-hp shot