Yes, changing those can give you more power. You can use an aftermarket intake that will let you use any 2 stroke carb. If you stick with the stock carb, use the sickbikeparts 4 stroke air filter, flows awesome. I'm using 7/8" ID flex pipe slipped over my header after cutting the muffler off. Adjusting the length changes your powerband, longer gives you more bottom end, shorter gives more top end.
Anything you do to change air flow needs jetting adjustments. I just use micro drill bits and solder.