Background and history

The 1991 Ford Sierra RS Cosworth 4x4 is the culmination of Ford’s successful push into performance and rally homologation during the late 1980s and early 1990s. The model combines the legendary Cosworth-developed YB powertrain with permanent all-wheel drive and a five-speed manual gearbox. For many enthusiasts, the 1991 4x4 variant is a well-judged blend of usability and raw character, with a chassis setup that responds immediately and an engine that tolerates upgrades without sacrificing drivability.

This example was imported from Germany and is presented by the seller as extensively refurbished both cosmetically and mechanically. The body has been resprayed in the original color and is reportedly 99 percent rust-free. The car is equipped with the period-correct Combat kit (front bumper, side skirts and wing) and rides on brand-new Momo wheels with new tires and 20 mm spacers. The most recent inspection with a pass was carried out on 2026-06-02. The timing belt has been replaced and the car has an upgraded race clutch.

Odometer and mileage: The seller states that the car has covered a total of 140,000 km and approximately 5,000 km since the comprehensive restoration. Supporting documentation in the form of invoices and specifications is included, according to the seller.

The seller indicates that the restoration is documented with a substantial binder of receipts from, among others, Burton Power and Hedströms Motor, and that the work was carried out without cost-cutting, with a focus on durability and function.

Equipment and options

• Sunroof
• Combat kit body parts (front bumper, side skirts and wing)
• Resprayed in the car’s original color
• New Momo wheels
• New tires with 20 mm spacers
• Adjustable coilovers
• Powerflex Black Series bushes throughout the suspension
• Front: Brembo 4-piston calipers with new discs and pads
• Rear: New calipers with new slotted discs and pads
• New Quaife ATB 7" Torsen-type differential at the rear
• New crownwheel bearings and crush washers in the differential
• New intercooler
• Competition engine mounts
• 330 kit: larger injectors, 3-bar MAP sensor and optimized software
• Upgraded race clutch
• Timing belt replaced

Modifications and improvements: The drivetrain is configured for higher loads with a Quaife ATB diff and upgraded clutch. Chassis and brakes are upgraded for precision and heat resistance. The engine is newly built with extensive machining and balancing at Hedströms Motor. The body has been fitted with a Combat kit and resprayed in the original color. The seller notes that few Sierra Cosworths are equipped with this kit.

Condition

Body and exterior: According to the seller, the car has been resprayed in its original color and the paint is judged to be in fine condition with an even finish. The Combat kit is installed and gives a more assertive look. Glass, trim, lamp lenses and badges are said to be in good condition. The seller states that the car is 99 percent rust-free.

Interior: The driver’s seat has damage on the side. The door cards have some blemishes on the inside. The headliner is described as in good condition for its age. The original steering wheel shows normal wear and all buttons are said to be intact and functional.

Tires and wheels: Brand-new tires mounted on new Momo wheels. Tracking and fitment improved with 20 mm spacers, according to the seller.

Mechanicals and functionality: The engine is fully rebuilt and newly assembled with a focus on durability, including boring, block decking, honing with a torque plate, polishing and inspection of the crankshaft, and full balancing of the rotating assembly. New pistons, conrods, bearings and ring set. 330 kit with larger injectors, 3-bar MAP sensor and software. New intercooler and competition engine mounts. Recent service with engine oil and filter change. The braking system—front with Brembo 4-piston calipers and new discs and pads, rear with new calipers, slotted discs and pads—has covered approximately 3,000 km since replacement. The gearbox and drivetrain are said to be in fine condition and are complemented by a new Quaife ATB 7" Torsen-type rear differential as well as new crownwheel bearings and crush washers. Timing belt replaced and the clutch is upgraded to race spec.

Service history

Documentation: Service book is missing. According to the seller, invoices for the entire engine build as well as other parts are included, with documentation from 2019 onwards. There are specifications from Burton Power and supporting documents from Hedströms Motor for the machining work and balancing.

Work performed: Most recent service carried out recently with engine oil and filter change. The seller states that the car has been driven approximately 5,000 km since the major restoration and around 3,000 km since the brake upgrade.

Summary

An imported 1991 Ford Sierra RS Cosworth 4x4 with a documented full restoration and well-considered upgrades. Resprayed in the original color, Combat kit, new Momo wheels and new tires. Mechanically built with a freshly rebuilt engine, 330 kit, Quaife ATB diff, coilovers and upgraded brakes. Reportedly 99 percent rust-free and recently inspected on 2026-06-02. The seller reports a total mileage of 140,000 km and approximately 5,000 km since the restoration. Accompanying invoices and specifications from well-known suppliers and workshops provide strong traceability of the work carried out.

For the enthusiast seeking a Cosworth 4x4 with an upgraded drivetrain and a well-documented overhaul, this car offers a combination of classic character and upgraded engineering, ready for spirited driving and continued stewardship.