Lowering and widening of lanes

Hello everybody, can you give me recommendations for lowering and spreading tracks? I have the jewel relatively new and would like to have it a bit more sporty My F13 has the 02VH Integral active steering, do I have to pay attention to something? Would you rather tend to Eibach or H&R? Some feathers make in the front lower than in the back. I like this optically, does this affect when driving? How much would you spread per axle? Can I then later still 21er or wider 20er Fe You know a suitable “Einbauer” around Frankfurt – the friendly one would like to have about 55 AW… I would like to have everything incl. ABE, so that I don’t have to register anything. Thanks + many greetings from Frankfurt