Uprated silicone hose replacement for part number: 06A121103. These are common failure on the 1.8T engines.Models Covered - VW Golf MK4 (1998 - 2004) - Audi S3 (1997 - 2003) - Audi TT (1998 - 2002) - Audi A3 (1997 - 2002)