Hello, we may try with http://simpsonraceexhausts.com/ Their system seems quite nice https://www.facebook.com/SimpsonRaceExhausts/posts/caterham-superlight-r300-k-series-exhaust-system-please-contact-us-with-all-your/724301474368103/ I made an inquiry via mail and their quote is 1200-1400+vat for one 4-2-1 system. I guess they may be willing to give a good price if we buy 2 or 3. Anyone in Bershire needing an shiny exhaust :)?