Manual Race Chain Tensioner for all VW 2.8-2.9L VR6 engines. The Manual Chain Tensioner is designed to replace the oem hydraulic cam chain tensioner. The OEM Hydraulic tensioners have a tendency to put too much tension on the chain guide under high rpm/high oil pressure conditions, resulting in loss of power and premature wear of the cam chain guides. With our manual chain tensioner you can adjust the chain 100% correctly. Features: high quality Stainless steel ARP Lock Nut Viton Seal-Ring manual adjustable 100% correctly chain tension replace the oem hydraulic cam chain tensioner Fits engines: VW VR6 12V engines VW VR6 24V engines A must for high performance vr6 engines. Manufacturer Information about the manufacturer BAR-TEK BAR-TEK Motorsport GmbH Im Rauschen Auel 3, 51491 Overath-Brombach, Germany info@bar-tek.com