What are the must-have performance upgrades for a Corvette Z06?

Honestly, with that A8 transmission, you might want to consider the GM Secondary Radiator Kit 84037858 first. VIR is brutal on heat. But seriously, dont skip the brakes or you'll regret it. I would suggest picking up Carbotech XP12 Brake Pads so you dont fade. Just be careful on those long straights because once that temp needle climbs, the car will pull timing hard and kill your fun.

I'd actually disagree. Over the years, I've found an LG Motorsports C7 Corvette Transmission Cooler is more vital for that A8's safety. Reliability is everything at VIR. You've got this!

Im a bit late to this, but I wanted to share my perspective from a few seasons at VIR. Tracking an A8 Z06 is basically a math problem where the answer is almost always 'too much heat.' When I first started out, I made the mistake of chasing lap times instead of reliability. It led to a very short, very expensive weekend where I spent more time in the paddock than on the tarmac. Safety has to be your first priority. Before you even touch the cooling, you need to address the brakes. I highly recommend flushing your system with Castrol SRF Racing Brake Fluid. It is pricey for fluid, but it has a massive boiling point margin that gives you a lot of confidence when you are diving into Turn 1 at 140+ mph. For pads, I have had the best luck with Ferodo DS1.11 Racing Brake Pads because they handle the weight and speed of the C7 much better than the OEM stuff without crumbling under the pressure. On the cooling side, if you already have the secondary radiator sorted, the next logical step for a $3k budget is the DeWitts C7 Corvette High Performance Aluminum Radiator. It has a much larger capacity than the stock unit and actually fits without a ton of hacking. Also, dont forget to check your oil levels frequently; these cars can be thirsty when you are pushing them hard. TL;DR: Spend your money on high-end fluids and endurance pads first. A car that wont stop is way worse than a car in limp mode. Get the DeWitts C7 Corvette High Performance Aluminum Radiator if the budget allows after the safety gear.

Jumping in here because I've been down this road and it is honestly so frustrating that we even have to have this conversation about a flagship car. I really hate to be the bearer of bad news but the cooling situation on the early C7 Z06s is just fundamentally flawed from the factory. The issues I had with mine early on almost made me give up on the platform entirely. Unfortunately, just swapping one part usually isnt the silver bullet everyone hopes for because the airflow through that front end is just too cramped. If you spend all your money on a radiator and ignore your fluids, you are asking for a disaster. The absolute biggest safety concern is the brake fluid. Please dont go out there with whatever is currently in the reservoir. Stock fluid boils way too fast and losing your pedal pressure at the end of a long straight like at VIR is a nightmare scenario. Also, keep an eye on your oil temps specifically. Even if the coolant stays okay, the oil in these LT4s gets cookin fast and the car will pull timing before you even realize it. If you are running that 8-speed, be warned that it generates a ton of internal heat compared to the manuals. You basically have to short-shift and stay out of the high RPMs if you want to stay out of limp mode. It is a total buzzkill to drive at 70 percent just to keep the car alive, but that is the reality if you havent done a full cooling overhaul.