Thanks guys. It's an interesting question and my current thought is to go base and then do aftermarket wheels as I'm really not a huge fan of any M5 wheels. Will probably do this after rotating through winters next year.
This is my first time buying a car with anywhere close to this much power so I'm not thinking I need any extra horses or a stiffer suspension (esp on public Toronto roads), but I might feel differently after 6 months...
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