Welcome to the forum,the questions your asking are answered in the tech articles,just click on the tab and scroll down,installing different pipes can mean you have to make changes to your fuel&air ratio if you have a carb(by the question i assume you have an efi scooter)which means you would have to remap if you have a power commander,or one of the other ones,( there was one disscussed here i just can't find the post,it was cheaper than a power commander and more user friendly)you just have to read and ask to learn which way to go with what you want,and there is always choices and someone here to help!and you don't always have to do the add ons.
Are you asking because you want new pipes?