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This product was last offered at the strikethrough price on
03-05-2026
A bad DISA valve can cause a variety of issues, from a loud racket in the engine bay, hesitation at low rpm and a rough idle with lean codes.
If the valve is making a loud noise, we recommend replacing it as soon as possible. It is possible for the pin holding the flap to be sucked into the motor causing serious damage.
Very easy to replace, just need to undo the 4 bolts holding it to the intake manifold.
Rein Intake Manifold Breather Valve | BMW E31 E38 M73 5.4L engine is a crucial component for maintaining proper crankcase ventilation and engine efficiency. Designed for BMW E31 and E38 models equipped with the M73 5.4L engine, this breather valve helps regulate internal pressure within the intake manifold, preventing excessive oil consumption and ensuring smooth engine operation. Over time, a failing breather valve can cause vacuum leaks, rough idling, and reduced performance. This high-quality replacement restores proper airflow and reliability.
Intake Manifold Regulator Valve - Rein | BMW E31 E38 M73 5.4L Engine is engineered to maintain optimal airflow and engine performance by regulating intake manifold pressure. A failing regulator valve can lead to poor throttle response, rough idling, and decreased fuel efficiency. This high-quality replacement ensures proper engine function and is designed as a direct-fit solution for BMW E31 and E38 models equipped with the M73 5.4L engine. Manufactured to meet or exceed OEM standards, this valve restores efficient air intake operation, improving overall engine performance.