BMW S1000RR General Discussion
Several posted they wish for dyno test on same bike, same day, same headers, different muffler... as in Akrapovic Long Can muffler comes with part number set
S-B10E9-APLT
Then the
Optional Header (SS)
E-B10R7
Then the Stock OEM Muffler
So the point is that the stock muffler on a...