not me but saw these:
http://cgi.ebay.co.uk/NSR250-NSR-250-Tyga-Exhaust-Pipes_W0QQitemZ8030593569QQcategoryZ10460QQssPageNameZWDVWQQrdZ1QQcmdZViewItem

bit doggy but might go cheap.
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MC21SP - Roth-tax
CBR400 - track
MC21R - sold
MC21SP - sold