Most people are totally stock, i'd say only 25-30% have modifications based on the first event. You really don't need upgrades unless you're going for a fast time. I ran totally stock the first time and had a ton of fun (even without track mode).
If it's your first time on a track, I think it's actually better to run stock before doing any modifications. The stock car is actually pretty darn capable!
I love how our Model 3 handle itself that's for sure.
I think it's a mix. I'm hoping to go with upgraded suspension and wheels/tires, but might not get the parts in time. If that's the case, I'll go and enjoy it in stock form.
What suspension and wheels/tire brand and size if you don't mind me asking?