Pat, read the post I wrote again....I said it is a better car than any of us can handle....that's a compliment.
exhaust? save your money, unless you just want something loud that everyone can hear (see your E46 exhaust).
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2011 Mineral White M3 ZCP - Opticoat, Ventureshield, some CF, B&B exhaust, AFE Intake Vorsteiner VFF 101s Ohlins
2014 Mineral White 328d Xdrive Wagon - Opticoat, Ventureshield, B8s, H&R, Apex SM-10s Hawk Pads
2021 718 Cayman GT4 - Fire extinguiser