Intake Manifold Adjusting Unit (DISA Valve), Rein - E46 325i, E39 525i, X3, Z3, Z4

This is the DISA valve located in the intake manifold of the M54 engine in the E46 325i, E39 525i, 2004-2005 E60 525i, 2001-2002 Z3 2.5i, and 2003-2005 Z4 2.5i. DISA is "Differential Intake Air Control", also known as variable length intake runners. It's a flap system that redirects the intake air inside the manifold depending on load and RPM. At low RPM the flap is closed which helps boost low and mid-range torque. At high RPM the flap is open all the way which provides the most air volume for high RPM power. A faulty DISA valve will cause the engine to feel sluggish or unresponsive in the low-mid RPM. There is no fault code for the DISA valve itself, although several related faults and check engine lights may be traced back to it - fuel trim, misfires, lean condition, and fuel mixture. There may also be a clicking sound from the driver's side of the engine bay as the DISA solenoid tries to operate the butterfly flap. The o-ring seal on the outside of the valve body can also fail and lead to vacuum leaks.

This is M54 2.5 DISA Valve is manufactured by Rein - an original supplier to BMW for many engine and intake components. It meets all of BMW's original design, fitment, and performance requirements and is TUV approved. An OEM manufacturer is the best alternative to more expensive Original BMW parts because they are virtually identical without the inflated price tag. This part has a two year warranty.

BMW Fitments:

3 Series
E46 (99-05) > 320i
E46 (99-05) > 325Ci
E46 (99-05) > 325i
5 Series
E39 (97-03) > 525i
5 Series
E60 / E61 (04-10) > 525i M54 (2004-2005)
X3 Series
E83 X3 (04-10) > X3 2.5i M54 (2004-2005)
Z Series
E36/7 / E36/8 Z3 (96-02) > Z3 2.5
Z Series
E85 / E86 Z4 (03-08) > Z4 2.5i M54