Muzzy pipe will be good for your mid and upper revs as it is a 4-2-1 pipe and as far as weight goes - you'll need to weigh the stock system to compare, but the Muzzy should come in about 13-14 pounds or so with full headers and cannister unless you went exotic with titanium or carbon fiber and that would be considerably less weight.
If you went stage 1, which it sounds like you will feel some low and mid range pickup.
By putting in K&N filters on your bike you are allowing more air to reach the carbs which in turn needs more fuel to match ie the jet size change
Stage 3 and going to the K&N filters would get you more air and you would have to change the jets again depending which ones they put in now. Your jet kit probably came with 4 sets of jets.
Stage 1 Stock pipe
Stage 3 Stock pipe
It's not as hard to do as it sounds and would be rewarding to learn how to do it.
Pirellis are sticky and expensive, but you can't go wrong with todays tires.
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