The final CSX was the 1989 model, designated as a CSX-VNT. This would also turn out to be the final Shelby Dodge, and marked two noteworthy technical advances: the introduction of a Garrett variable-nozzle turbo (VNT) and the application of composite wheels. Designed by Shelby and produced by Motor Wheel Corporation, they were known as "Fiberides" and were marketed as lighter than contemporary wheels.

The engine was the new intercooled Turbo IV equipped with a Getrag A555 five-speed manual transmission. The variable geometry turbo vanes were computer controlled and needed no wastegate. Instead, they adjusted the flow of exhaust gasses to spool up the turbo straightaway and deliver strong power. Chrysler kept the horsepower rating at 175 hp, but upped the torque rating to 205-ft/lbs at an unheard of 2,100-rpm. Full torque was available from these low revs to well past redline. Turbo lag was virtually eliminated, with full boost available at 2,100-rpm.

Car and Driver magazine labeled the CSX as "a high tech hot rod" and "a technological showcase" and were impressed with the engine's flexibility and top-gear acceleration. Examples with the VNT turbo system intact are today considered more valuable to collectors, and time has proven them to be quite reliable. A ground effects aero package produced by Kaminari Aerodynamics gave the CSX-VNT an appealing low appearance. The suspension was also modified, with experienced drivers admiring the lightning quick, yet neutral handling. Shelby chose Exotic Red, a mix of bright red and maroon tones, with gold wheels and trim to finalize the car’s presentation. According to period price guides, the MSRP was $15,995.

Production was limited to 500 vehicles (including two prototypes) and with the completion of these cars; Carroll Shelby's direct involvement with Dodge was complete. He would be found later often taking advisory roles, which included the development of the Dodge Viper and Viper GTS. This example has a gray interior and is offered with two sets of wheels and also displays some slight paint fade. The second set of wheels are the factory Shelby composite Fiberide set that came on the car originally.

The 1989 Shelby CSX-VNT has proven to be a true domestic exotic car by having technologies not otherwise realized in a gasoline application until 2006 when Porsche utilized variable vane turbochargers for their new 997 model.