Tenneco Inc. designs, manufactures, and sells clean air, powertrain, and ride performance products and systems for light vehicle, commercial truck, off-highway, industrial, and aftermarket customers worldwide. The company operates through Clean Air, Powertrain, Ride Performance, and Motorparts segments. It offers clean air products and systems, including catalytic converters and diesel oxidation catalysts; diesel particulate filters(DPFs); burner systems; lean nitrogen oxide (NOx) traps; selective catalytic reduction (SCR) systems; hydrocarbon vaporizers and injectors; SCR-coated diesel particulate filters systems; urea dosing systems; four-way catalysts; alternative NOx reduction technologies; mufflers and resonators; fabricated exhaust manifolds; pipes; hydroformed assemblies; elastomeric hangers and isolators; and aftertreatment control units. The company also provides powertrain products and systems, such as pistons; piston rings; cylinder liners; valve seats and guides; bearings; spark plugs; valvetrain products; system protection products; and seals and gaskets. In addition, it offers motor parts, including steering and suspension, braking, sealing, engine, emission, and maintenance products, as well as shocks and struts; and ride performance products and systems comprising advanced suspension technologies, and ride control and braking products, as well as noise, vibration, and harshness performance materials. The company was formerly known as Tenneco Automotive Inc. and changed its name to Tenneco Inc. in 2005. Tenneco Inc. was founded in 1996 and is headquartered in Lake Forest, Illinois.