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If you are getting a catch can for a Mini Cooper with a N14 or N18 engine you MUST order the MA1071-11 Special Application Part. This comes with a Aluminum PCV Connection Adapter.
This consists of MP1065-18, MO1065-19, MP1065-20 and MP1065-24
Installation guide: Mini Cooper N14 and N18 Aluminim PVC Adaptors