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The car in stock form can easily keep up with your skill until you're well at the very fast end of the advanced groups. Brakes and cooling don't need to be upgraded. Brakes are phenomenal. There are some rare reports of auto trans cars overheating on track but a lot less likely up in the pacific NW. High temp brake fluid is really the only thing needing a swap.
Suspension upgrades - not necessary at first but eventually, the best bang for buck might be finding lightly used DSSVs off a ZLE. If you're one of the people who bought a regular ZL1 because they wanted to maintain some semblance of street comfort, you could consider adjustable coilovers like MCS but that'll be more expensive.
Tires and an extra set of wheels are a good start. The staggered set up is good for handling characteristics. A square set up is probably better once you get quite a bit faster and does help with tire wear, but comes with small headaches like extended studs and spacers. You can also start getting the car a bit oversteery on corner entry which is disconcerting at first and could actually make you drive slower.
Lots of good info on the track section of the forum, and plenty of different pathways to suit your particular interests, skill, budget, etc.
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