CSX

The CSX was a limited-production, high-performance variant of the Dodge Omni and Plymouth Horizon, built by Chrysler under the technical direction of legendary race engineer Carroll Shelby from 1987 to 1989. It was fundamentally a front-wheel-drive hatchback fitted with a 2.2-liter turbocharged inline-four engine producing 175 horsepower, paired with a manual transmission. The CSX represented one of the last personal projects Shelby took on before stepping back from automotive development, marketed as a street-legal performance car at a time when American manufacturers were largely abandoning high-output compact cars.

The most significant variant was the CSX-T, which received a higher boost level and tuning to deliver 223 horsepower. This version was rarer, with fewer than 500 built across all model years. Shelby's involvement was primarily in engine calibration, suspension geometry, and brake upgrades rather than from-the-ground-up design; Chrysler handled manufacturing using existing K-car architecture. The car came equipped with Shelby-specific badging, a functional hood scoop, upgraded cooling systems, and lowered suspension with stiffer springs.

Ownership revealed the practical realities of turbocharging a compact, front-wheel-drive chassis in that era. The combination of strong power delivery and relatively light weight made the CSX quick in a straight line, but turbo lag was pronounced below 3,000 rpm, and torque steer during hard acceleration required careful throttle management. Carburetor-style fuel injection systems of the period were less responsive than modern direct injection, which sometimes caused hesitation during transient throttle inputs.

Market position and decline

The CSX arrived as insurance companies were raising premiums on any car bearing a performance label, and fuel prices were beginning to climb again. Chrysler produced only around 3,175 CSX models across three model years, making it a niche product. The car competed poorly against Japanese turbocharged offerings like the Toyota Corolla GT-S and Honda Civic Si, which had more refined engineering and better dealer networks. By 1990, Shelby's involvement with Chrysler had ended, and the CSX nameplate disappeared entirely.

The 'CSX' designation combined Chrysler's corporate nomenclature with Shelby's historical branding; the partnership was marketing-driven, intended to leverage Shelby's reputation in performance engineering during an era when American muscle car credibility had eroded. Today, the CSX occupies an odd historical space: too obscure to command the collector attention given to 1960s Shelby Cobras and Mustangs, yet too short-lived and compromised by K-car limitations to achieve the cult status of some other 1980s turbo cars. Original examples are increasingly difficult to find with intact powertrains, as the turbocharged 2.2 engines were prone to bearing wear and carbon buildup over extended service intervals.