This one is a different angle in a 2017 WRX sti, surprisingly the best time I got with this was 0.013 seconds slower than the Redline. (Shows how far the VF2 has come in handling dynamics as the WRX 10 years earlier would run rings around any Commodore.) In terms of upgrades. Brake pads are a must. Brake fluid to high temp is a must. (Some people do every track day I change every 12 months) factory is 24 months. Tyres - street tyres are fine for casuals as you will just hit their limit sooner but unless you are serious and will invest in some rims and semi slicks which is costly for a few days a year. Tyre pressure is important, I run close to 30psi when cold as they heat up considerably and increase to high 30s. You will wear your tyres a fair bit but I still got 30k km out of the rear set with 3 track days. Engine oil - change sooner, some people change every track day, I just change it every 7.5kms with a good quality oil. Had analysed and wasn’t too bad. Gearbox and diff fluids - half the manufacturer recommended intervals. Other than that just check your car for any leaks or unusual issues like bushes etc as there is plenty of force on the car.