This filter comes with a silicone coupler so is designed to clamp on to the outside of a rigid hard pipe such as a MAF. These filters have an aluminium ram-pipe neck and a cone shaped filter element. This integral cone channels all the incoming air, towards the inlet manifold, and in doing so, reduces unnecessary turbulence. These filters are also cone shaped because it enables easy fitting to space restricted engine compartments and with the extremely large amount of pleated surface area an added boost of power to your engine too! These filters are made using a high quality, high flow, synthetic nanofiber filtration media which is pleated to maximise surface area and in turn increase air flow. Utilising over 35 years of experience in the field of motorsport filtration the pleated range by Ramair is the premium choice on the market today for your fast road or track car. With its large size, technologically advanced filter and bell mouth alloy spun base this filter kit is capable of handling extremely large power & flow rates. Filter Outer Neck Diameter: 63mm (2.5inch) Filter Neck Length: 45mm (1.8inch) Filter Overall Length: 185mm (7.3inch) Filter Base Width: 150mm (5.9inch) Filter Top Width: 120mm (4.7inch) Filter Material: Pleated Nanofibre Filter Base Material: Filter Base Finish: Black Powder Coat