@TrubbishBish If you think the 2021+ M3P has good grip with the OE Pirelli PZ4, wait till you try better summer performance tires. Putting 245/45R18 Bridgestone Potenza Sport on 18x8.5" wheels on my M3P was a improvement dry and wet over the OE PZ4.
Personally I wasn't quite happy with the car's grip stock, it was okay for a street car but I wanted a bit more, and I definitely got more with the new tires (still same category, they're not track tires). Before I tried this setup I thought I might want wider wheels eventually, but now I feel no need for that at all.
For sure wider wheels could get me even more grip, but maybe try just better tires first, you might find that's enough without the downside of wider wheels. (Now if you're doing track days or especially autox or other timed events...I'm sure you'll want all the wheel and tire width you can easily cram in there. My M3P is strictly a street car for now.)
Personally I wasn't quite happy with the car's grip stock, it was okay for a street car but I wanted a bit more, and I definitely got more with the new tires (still same category, they're not track tires). Before I tried this setup I thought I might want wider wheels eventually, but now I feel no need for that at all.
For sure wider wheels could get me even more grip, but maybe try just better tires first, you might find that's enough without the downside of wider wheels. (Now if you're doing track days or especially autox or other timed events...I'm sure you'll want all the wheel and tire width you can easily cram in there. My M3P is strictly a street car for now.)