*** Newbie *** Request advice on exhaust & rims ***

Hallowechen…. Before I have to admit that I am a total newcomer in the Mercedes brand I would be grateful for a pair of tips, pictures, prices etc regarding rims & exhaust tuning at a Mercedes S 350 bj 12.2003. My buddy bought one and we search through now the net looking for a few send 19 or 20 inches and a grim good exhaust system is only provided, no car body work because of the rims… thank you already in advance Dear Greeting Michel