Depends on if you will actually use the increase....which gear do you intend to rev the motor out to 6900 revs?....
I asked myself the same question and decided that i probably wouldnt use it, so left it at factory....in the end it dosnt matter....just my thoughts.
Unless the engine has had better cams fitted there is no point in trying to rev it higher/harder it wont get you there any faster it makes it's torque and Max HP below 6000 RPM. Raising the speed limiter will however allow it to go beyond the factory set speed limiter setting, easily.
As everyone has said but I would add--------- remove the stock air intake and let the bike suck some air you will be pleased and the bike will thank you