Air Check Valve - 911 | 1984-1998 99610622257 Base outside diameter: 2 in

Base outside diameter: 2 in (51 mm)

Impressive Dyno-Proven Gains: Delivers significant power increases of 31 whp and 19 ft-lbs of torque with Sport Cats

Porsche Huf TPMS valve stem set for all models

and wiring harnesses for a hassle-free

Air Check Valve - 911 | 1984-1998 99610622257 Base outside diameter: 2 inAir Check Valve For Porsche 911 (1984 1989) 964 (1989 1994) 993 (1995 1998) Models. The Air Check Valve for Porsche 911 controls airflow within the engines vacuum system, preventing backflow and ensuring proper operation of emission controls. Built for a precise fit, it helps maintain engine efficiency and supports clean emissions. An essential component for preserving your Porsches performance and environmental compliance.