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There are several good makes MM, I'd put them in order of preference:
DP / Remus
Leo Vince
Silmoter
Termi
Arrow
There are others which are fairly good as well.
Fitting cans alone shouldn't upset the fueling, but adding an open airbox / K&N air filter as well will require adjustments. On carbed bikes this means rejetting and a dyno setup, on injected bikes (620) the easiest way is to fit a power commander, not that cheap at £250 odd but there's no easy way to do it.
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