Cooper s Bj 2005 Wheels/Exhaust

Hay people, I bought a Mini Cooper s today Bj 2005 and wanted to ask you now some questions: – 18 inch rims are no problem with deeper springing or ? Ca 30mm deeper – which ET I need the rims are finally with the kotflügen – which tires I need at 18 inch (dimensions) – which exhaust from kat can you recommend should make a nice dull sound (max 1000€) – which rims you can recommend I thought of OZ (max 140€ with mature) Grü ße and thank you already