@S2K_MoZo Unfortunately I haven't done track days in years, and I have no plans to track our M3P. It's a family car shared with my wife and needs to be reliable and streetable without the risks or compromises of track duty. Plus lack of time or money for the hobby for foreseeable future.
That said I have some opinions, based on how my M3P feels vs cars I have driven on track...
I have the Redwood Motorsports "Performance Sport" Öhlins DFV coilovers. For a sporty street car, with or without occasional track days, I think they're pretty much perfect stiffness, and the front:rear balance is excellent too. I wouldn't want softer if I was doing any track days. (I wouldn't want "GT" or "Comfort" coilovers for that.) I don't want softer even for my street driving! But I am someone who drives fast and shreds up the twisties on a regular basis. These coilovers are phenomenal for that, while still riding well enough to get some very positive comments from my wife - so long as the dampers are set only halfway firm. (The stiffer settings she doesn't like. And that's okay! I like halfway firm too, and when I want more, it's 2 minutes max to change all four corners.)
If I was planning on a
lot of track time, and especially with serious rubber & camber, I would want something firmer. Such as the Redwood "HPDE/Race" kit, or the Öhlins Road & Track kit, or one of MPP's race/track focused options. Going that stiff would make most street driving worse than what I have now, but would be worthwhile if tracking the car regularly, I think.
For heavy track use I'd also go to town upgrading as many mushy rubber mounts and bushings as I could stomach. In my limited experience that makes a big difference in how responsive a car feels at its limits. For my street-only M3P I've only upgraded a few bushings, it's definitely
not full track rat stiff.
Besides suspension tuning, I think all the usual stuff for track duty applies. Track pads and DOT4 fluid would be a must. Camber-adjustable control arms as there's basically no camber adjustment stock. You'll also want track-worthy tires, figure roughly 200-240 TW or thereabouts, depending on your goals. When I was doing track days + daily driving on one car, I managed to find tires and camber that worked well for both, so I didn't need to swap those things for track days. Brake pads I ended up swapping between street and track though. I tried some "compromise" street+track pads that turned out to be not great at either. That said there's a whole lot of dual use compromise pads out there to try, maybe some of them work decently well. For me, once I went to serious track pads there was no going back.
There's more to think about though. From what I've read, the M3P can only turn a limited number of hot laps at full blast before thermal throttling kicks in significantly. (Exactly how soon it will throttle is probably very course-dependent.) That's actually better than most EV's, but obviously not great as a track toy. Most here who do track days on a daily driver seem to just live with that, but I'm not sure I'd be happy with it, I've been there with an ICE car struggling to stay cool on track and I didn't find it much fun. The builds I've seen that really addressed the thermals involved frunk delete (to fit everything), lots of extra radiators, custom cooling loops, aftermarket cooling controllers, etc. Looks doable but definitely a compromise for street use.
Then there's the logistics and compromises of keeping it charged. Are you going to sacrifice a session or two to hustle to the nearest Supercharger/DCFC for quick topoffs? Or maybe get by with just a 240V plug you found somewhere in the paddock? Either way you should expect to miss
at least one session for charging, if not two, except maybe if you're lucky to have a Supercharger/DCFC right next to the track.
Then there's the lack of seat bolstering. For regular track use in this car I'd want a harness or/and a racing bucket. Installing either one will probably bring more compromises for street use. Honestly I'd like to do something about this even just for tearing up the twisties.
I think the M3P has really fantastic driving dynamics after a good suspension upgrade (yes I push mine to its limits at times on empty roads with nobody and nothing around), and I bet it's really fun to track when properly setup, but some of the logistics and compromises around tracking one are not exactly trivial, in my opinion. Many do it though!