Caterham Seven SV lightweight Carbon Fibre (wide) rear diffuser. Suitable for Caterhams with De-Dion rear axle, this diffuser increases down-force with a minimum penalty of drag. We are able to provide a fitting service for this part, please contact us first to discuss your requirements. Note: If you have independent rear suspension on a CSR then please let us know as you do not need the lower side cut out to clear the De-Dion bracket and lower arms.