Founded in 1976, HJS Emission Technology stands for innovative exhaust technology from Menden, Germany. The family-owned company has been developing and manufacturing catalytic converters and exhaust systems for motorsport since 1990. This expertise directly shapes its tuning range for road cars. The portfolio includes performance downpipes with ECE R103 approval, motorsport and universal catalytic converters, and high-quality components for custom exhaust systems.

At the 2026 Nürburgring 24-hour race, more than 80% of the competing vehicles relied on HJS technology. Premium brands in particular value the quality and reliability of HJS products. HJS combines technical expertise with a passion for performance – on the racetrack and on the road.