Shelby Supercar engine in the base Aero model is same as the previous year, but the Ultimate Aero has a 6.35-litre (387.2 cu in) engine, rated at 1,183 bhp (882 kW) at 6950 rpm and 1,094 lb·ft (1,483 N·m) torque at 6150 rpm, and the supercharger is replaced by a twin turbocharger with cabin adjustable boost pressure. The car is designed to use 91-octane gasoline. The 6-speed transmission is readjusted to increase the theoretical top speed to 273.75 mph (437 km/h) at 7200 rpm, however whether the vehicle is able to reach this speed is highly questionable and has never been tested.
Twin-Turbo V8 Engine with 1183 hp, base price is $654,400. Tested in March 2007 by Guinness world records
Wheels on the base model are sized 18-inch at the front and 19-inch at the rear, while the Ultimate Aero TT has wheels an inch larger at each end.
The 2007 models are heavier, with the base model weighing 2,850 lb (1,290 kg), and Ultimate version 2,750 lb (1,250 kg). Unlike the previous year, base models have a navigation system, 10-speaker audio/CD/DVD system, video/DVD screen, back-up camera, air-conditioning, and trunk space as standard equipment. These come optional on the Ultimate.
The first production 2007 Ultimate Aero TT car was sold on eBay for US $431,100. Later cars are expected to cost US $654,000. Only 24 Ultimate Aero TT's are going to be produced from 2006-2007. The Ultimate Aero TT made its international debut on the International Show Circuit in November 2006, culminating with the world record top-speed competition held in Wolfsburg, Germany in May 2007.