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711 Posts
Yes,
you are right.
We had two identical 1090RR on the dyno at a local shop,
one with the Arrow headers and the other with Arrow headers and the HP Corse muffler.
The one with the HP corse had dramatic loss in Power - mainly at mid revs. Up to 20 hp.
Without baffles it was much better, but never matched the OEM muffler.
I hope this helps you
Jochen
you are right.
We had two identical 1090RR on the dyno at a local shop,
one with the Arrow headers and the other with Arrow headers and the HP Corse muffler.
The one with the HP corse had dramatic loss in Power - mainly at mid revs. Up to 20 hp.
Without baffles it was much better, but never matched the OEM muffler.
I hope this helps you
Jochen