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A bit of forum digging for ya, others can correct if I am wrong....
- Euro M3s before 03/2005 use Catless Headers. PNs 11627830658 and 11627830659
- Euro M3s after 03/2005 use CSL catless headers.
- Euro Z4Ms always used CSL headers. PN 11627833500 and 11627833501
- USA Z4Ms PN 18407836640 and 18407836641
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