Your scoot isn´t going to blow up cause you change to a different pipe, you dont have to do anything really, but it is good to change the jet to a bigger size, 5-10 numbers bigger. You also would have to change weights in the variator too if you want it to be optimal but it isn´t needed.
The pipe you mentioner is a good pipe to start with and works very well with a standard engine.
What the oher things do is a long story and i don´t have the time to tell you all that, search around on this foum a little and you will soon know what they are. You have to learn yourself what this parts are if you are going to tune your scooter, just like everybody else have done.
It would be easier if you find a forum that is in your own language.
Edit; search on google picture on: variator and you will se what it is, you can even search there for the parts you wonder what they do.