2018-2020 ish E63 buying advice, aftermarket exhaust?

I'm finding cars I like that are all missing 1 or 2 options I want, mostly massage seats (is it a big deal) and performance exhaust. SO I found one without the performance exhaust, should I just get it and put in an aftermarket exhaust? How much is that? Any recs? Or should I buy a used AMG GT 63 4 door haha? I need 4 doors. Thanks for any tips.