Law / Legal limits of tuning a car performance in Poland [2]

What is the legal limits of tuning car in Poland ? Anyone can share link, book name or law article with me ?
I'd like to know the limits not to cause problem with police :)

Life / Where and how can I report parking violations on my street in Poland? [7]

Hello;

I am tired of the people who is parking inproperly and taking 2 car slots with one car. Is there any way to report that people ? Honestly speaking, i will do that everyday until this people will learn how to park properly..