Prevents excess pressure from building within the systemAudi All Road All 2.7T
Audi B5 A4 All All
Audi B5 S4 All All
Audi C5 A6 All V6 30v
Audi C5 A6 FWD V6 2.8L
Audi C5 A6 Quattro 2.7T
Audi C5 A6 Quattro 4.2
Audi C5 A6 Quattro V6 2.8L
Audi D2 A8 All All
Audi D2 S8 All All
Volkswagen Passat B5 All 1.8T
Volkswagen Passat B5 All TDI
Volkswagen Passat B5 All V6 30v