This kit is required for all airbox covers with an integrated speedometer unit.The Cult-Werk air filter cover kit consists of 2 parts, an extremely flat cover for the air filter itself and a very flat upper part of the air filter box.Milled on the most modern 5-axis CNC machining centers, no adjustment work required.ABS plastic.It is important to close the air filter box otherwise water and debris might get into the engine and damage it.