In listed VW/Audi units, wear at the inboard end of the boost regulator bore can reduce the ability of EPC/TV pressure to stroke this valve open. Full boost exiting this valve combines forces with the main regulator spring, increasing line pressure. Sonnax oversized boost regulator valve kit 119940-07K allows the bore to be refurbished and restore proper pressure control.

• Oversized hardcoat anodized valves are manufactured to extremely tight tolerances and resist wear
• O-Ringed end plug positively seals the bore and prevents regulated boost line pressure from exhausting
• A new spring is included to work with the oversized valve and re-establish OE regulated pressure specifications
• A replacement ratcheting end plug is included as the OE one often breaks