The Hockenheim 422XE is designed specifically to fit Vauxhall/Opel C20XE engines up to 210bhp as found in the Caterham Seven with Vauxhall C20XE JPE and HPC engines. The 422XE utilises a standard 422 air box with a specially designed back plate that allows for a neat and compact air intake. Air intake options can either be 75mm or 100mm diameter moulded in from rear as shown (422XE75 & 422XE100 respectively). The 422XE variants are compatible with our range of trumpet socks or remote air filters and can be trimmed to any depth up to 239mm to suit your application. Backplates are easily custom drilled. Volume; 14.5L