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BMW suffers from a common issue with the swirl flaps in the inlet manifold. The Screws holding the butterflies can come loose and can cause severe damage to your engine. It's a well known issue that has been discussed many times in the BMW forums & magazines. The easiest way to prevent this problem is to fit these swirl flap blanking plates into your intake manifold. The swirl flaps are with poor design, they are prone to failure. When the swirl flap broke, the debris falls into the engine. Sticking in the valve port causing the piston to collide with the valve or falls into the cylinder itself and damaging the piston and the head. Swirl flaps for BMW 6 cylinder diesel engines M57 Suitable for the following BMW models: M57/M57D30 ( from 1998 ) 184 PS.