any weight loss is good, and no loss of stability should happen.
quite the opposite, less weight that's up high and on the very back of the bike is a blessing, less of a "pendulum" effect.
to gain power in meaningful way you'd need a very loud open silencer and jetting changes to match. IMHO not recommended in a bike to live with.
In my 600 motard i went with a semi racing silencer but with db killer baffle installed. Without the baffle it power fell on its face, bike was too lean.
dont fall into the common perception mistake that a noisy bike = faster bike
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