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The powertrain specialists from HMETC added HKS spark plugs, a K&N high-flow air filter, and a lightweight Milltek Sport quad-tip exhaust with deleted catalytic converters. They also exchanged the stock transmission cooler for a six-row unit and recalibrated the eight-speed automatic for quicker shifts. The upgrades brought the Stinger GT’s twin-turbo 3.3-liter V-6 up to 422 horsepower and 413 lb-ft of torque, or 57 horses and 37 lb-ft more than stock.
The interior was gutted and all parts not essential for track duty, including window regulators, parking sensors, and the sunroof, were removed. In total, the conversion shaved off nearly 330 pounds—and that’s after a roll cage, racing bucket seats, harnesses, and a fire extinguisher were installed. The project rides on lightweight OZ Racing wheels wrapped in Pirelli Trofeo R performance tires. The front crossmember was modified to grant 2.5 degrees of negative camber, and the front anti-roll bar was increased to 25mm while the rear bar was swapped for a 17mm unit. The stock dampers were retained, but the adaptive damping system has been disabled in favor of a fixed-rate setup tuned for the track. The GT420 is lowered on Eibach Pro springs and relies on six-piston Brembo front brake calipers and 15.0-inch rotors to stop.
To complete the track car look, a Stillen front splitter and rear diffuser were installed, along with an Air Design rear spoiler.