High performance valve stem seal VITON for all 2.5L TFSI in the Audi TTRS and RS3. This valve stem seal offer the following advantages: High temperature resistance Improved sliding properties Longer service life Can be used on both intake and exhaust valves. When using new valves, the guides must also be renewed! Price for 20 stem seals. For the complete engine you need 20 pieces. Manufacturer Information about the manufacturer BAR-TEK BAR-TEK Motorsport GmbH Im Rauschen Auel 3, 51491 Overath-Brombach, Germany info@bar-tek.com