They are German.
The C14 page is here
http://www.bos-exhausts.de/index.php?id=237&L=2%20%20%2F%2Findex.p...option%3Dcom_rokdownloads%2F%3Foption%3Dcom_rokdownloadsUK distributor is on 44 117 9719200 (The Key Collection)
The factory is here
Bos Auspuff GmbH
Reitgaarstraße 2,
49828 Neuenhaus
Tel: 0049 (0) 5941 - 4793
Fax: 0049 (0) 5941 - 5364
info@bosauspuff.de