I know ****** all about these computer bizzos, but I can ride a motorbicycle! I have a 2011, 660 that I am coming to terms with. "****loads of years on bitumen you see". My other motorbicycle is an 1150gs. Lovely thing! I digress, the Tenna is a slugg in standard trim but the purchase of a Barret muffler has given a slight increase in performance, not to mention a "horn note" on song if you know what I mean!!! It has not been tuned for the muffler yet but...