The North American versions of the Horizon were known as the Dodge Omni and Plymouth Horizon.
Although they appeared to share the same external bodywork as the European Horizon (the panels were in fact not interchangeable), they were vastly different mechanically — using a larger engine (of VW, then PSA origins on the early versions, replaced by Chrysler's own 2.2L OHC "Trenton" I-4 later) and MacPherson strut suspension at the front instead of the more complex torsion bar arrangement.
They also featured larger reinforced aluminum bumpers to comply with stricter US safety legislation. Despite the car's European origins, then Chrysler chairman Lee Iacocca played this down, emphasizing that features such as the trip computer and electronic ignition were of American design.
In the US, many variants were eventually produced, including three-door coupé versions ("Charger" and "TC-3 / Turismo"), econo versions ("America", "Miser"), and powered-up versions such as the GLH, GLH Turbo, and Shelby GLH-S (turbocharged, intercooled, 174 bhp).
Even a small pickup truck was based on the Horizon ("Scamp" and "Rampage"). Some of these cars had successful careers in racing venues such as Auto-X, road and endurance racing, and pro rallying.