MACH 2 ATMOSPHERE UPGRADE KIT TO CONVERT T9107 & T9125 FROM RECIRCULATING TO ATMOSPHERE VENTING BOV. CONSISTING OF TRUMPET, SPRING AND PLUG. There is a harder spring supplied in this kit, as the valve needs to remain closed at idle when venting to atmosphere. This prevents stalling and backfiring.
AUDI A4 1999 2000 2001 T B5,8D5 1.8 T AJL 1999 - 2001