RE: MVVS Exhaust option
% wise - in the North American market - it is obvious most users will opt for a in cowl device.
The fact that they reduce hp from 20% to 40% and are relatively noisy has become acceptable here.
For those who are not satisfied with the "easy" path, The cans and pipes are welcome.
It is also acceptable to promote sales using power figures using cans/pipes etc., and dismiss the true losses as " somewhat less". It works for the car mfgrs
Again, Caveat Emptor.