Could well be Arquebus, was made by the previous owner, bike wasn't running when bought and whilst getting it running I went back to the original headers with some decent mufflers, so I've not actually run the bike with them on.
As regards the downpipes, my engine is in a mild state of tune, high comps, ignitech, 41mmfcrs, light flywheel and full Sil system. It produces about 85bhp at the rear wheel. Whether the headers make that much difference, I dont know, but theres certainly a weight saving over standard, much lighter. I may go 944 one day....
