Hej och välkommen till forumet!
Lite googlande fann detta:
Harpoon tycks ha bytt namn till Krieger.
http://www.vsource.org/VFR-RVF_files/BExhaustmods.htm
"Harpoon is a Spanish company about which there is very little information on the Web, but which appears to have been re-named "Krieger". They made/make a rather TBR-esque oval end can with cast aluminum end caps in carbon, carbon/kevlar and aluminum in various colors. The photo below is of a high-mount carbon fiber slip-on mounted on an early RC36, which was, according to the "Way Back Machine", once available in a road-legal version in carbon fiber or aluminum. The current Krieger Web site includes an application chart that shows a high-level oval exhaust can available for the early RC36, but the only end can that is clearly road-legal is a round version that is not listed for this bike. There is a US importer, Centre Cycle Works (PA), but they do not inlcude this model in their application chart. Prices appear to range from $305-405, depending on finish and whether they can get them for this bike."
Liknar dämparen på bilderna det du har?