Features:<br> 1.For BMW's suffer a common issue with the swirl flaps in the inlet manifold. The Screws holding the butterflies can come loose can cause severe damage to your engine. It's a well known issue that has been covered many times on the for BMW fo s & magazines. The easiest way to prevent this damage occurring to your engine is to replace these swirl flap bungs with these.<br> 2.The swirl flaps are with poor design, they are prone to failure. When the swirl flap broke, the debris falls into the engine.<br> 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.<br> 3.blanks are manufactured from reinforced aluminum, that's designed for automotive use. 100% brand new and high quality<br> Specification<br> Suitable for BMW E87 E46 E60 E61 (4 cylinder)<br> For BMW E30 E46<br> 3 Series E46 03-06 320cd 330cd<br> 5 Series E39 97-03 520d 525td 530d<br> Color: Red + Silver<br> Material: Aluminum + Silicone<br> Package Contents:<br> 4 * installed swirl flap 22mm<br> 4 * square heterosexual ring<br> 5 * round heterosexual circle<br> Only the above package content, other products are not included.<br> Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.