This filter has a rubber polymer base and a cone shaped filter element, it has a spun aluminium base that acts as a velocity stack smoothing the air flowing into the intake hose, reducing turbulence, allowing maximum potential flow. These filters are cone shaped because it enables easy fitting to space restricted engine compartments and with the extremely large amount of foam surface area an added boost of power to your engine too! With its extra large size, technologically advanced filter is capable of handling great flow rates. The filter is specially strengthened using a stainless steel internal mesh, which we have developed & used in european and world touring cars! With its extra large size, technologically advanced filter is capable of handling great flow rates. External Neck Diameter (mm) Filter Height (mm) Neck Length – Trumpet Only (mm) Filter Base Width (mm) Top Width (mm) Material Unit Quanity 90 275 60 192 110 Twin Layer Foam Body / Polymer Base / Aluminium Velocity Stack 1