Shop Cometic MLS head gaskets at MS Motorsport. Cometic multi-layer steel gaskets give a stronger, more durable head seal than the standard gasket, which makes them a popular choice for modified and high-output engines. We stock them for the BMW M50, M52, M54, S50, S54 and S65, in a range of thicknesses so you can set your compression ratio and piston-to-head clearance.