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Personal view:
I am not an exhaust replacement person for looks at all but about any exhaust/muffler change:
In general, for our single-cylinder engines, the volume of the can is important (if you want to keep or increase the BHP).
The famous German tuner at Pirate-Racing has done numerous dyno tests on mainly 690's (single-cylinder) engines and without any exception, all the larger cans perform better, be it on a standard engine or PCV piggyback.
As mentioned before, I have tried an Ixil Hyper-low and a MIVV (both full exhausts) on mine and although not on a dyno, returned back to the 'teapot' OE (first-series).
It appears our engines need the larger volume silencers in order to produce or increase the power.
 
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