Tenneco's emissions-control products meet strict air-quality legislation, optimize engine performance, improve fuel economy, and acoustically tune engine sound to fit a vehicle's profile. Ride-control products enhance safety by enabling improved steering, braking, and acceleration as well as ride comfort. Champion, Fel-Pro, Moog, Monroe, and Walker are some of Tenneco's well-known aftermarket brands. In 2021, 40% of revenue came from North America, 36% from Europe, 18% from China, and 6% other regions.