I would agree with jwx on the power gains of the Taylormade. All the dyno charts I've seen does show some gains, but not like many of the other brands out there (Akra, Leo, Austin, Brocks, etc.).
As far as doing it... if you get a full system, do get a power commander. Not 100% necessary, but you will make the bike run like it should and finishing getting the gains out of the pipe that are there to be gotten.
As far as needing more power... heck, not many people "needed" the most power production bike anyway, so I guess it's more desire than need. Go for it! The sound is MUCH better than stock, shaves a little weight, and the power increase is definitely noticeable.
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