DISA valves control the intake manifold runner length to improve engine performance at different rpms. When they fail, the DISA valve bangs around in its housing, making a rattling noise accompanied by rough idle and off-idle hesitation.
If your BMW experiences these symptoms, don't wait to fix it. In some cases, parts of the DISA--including a metal spreader pin--can be sucked into your engine, causing serious engine damage.
Easy to replace, your new DISA screws to the side of the intake and comes with pre-installed sealing gasket.
Click HERE for your E53 X5 3.0L Disa Valve Kits