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I started two years ago tracking the M3.
I don't think any modification is necessary, mods are nice, but not necessary. However, the OEM setup and equipment consumes itself at a rate that is nothing like the road.
So depending on your drivings style, track layout and how much you would like to push the car, you need to make sure the OEM equipment is at its best.
So, rather than fancy brake fluid, get a fresh fluid and bleed. Rather that fancy brakes, make sure the pads are new and the rotors are not on the margin.
The single most important change from a cost perspective is camber. I basically destroyed two front PS4S on two track days by taking the outside to the cores.
My advice is to pull the pins out and do -1.8 front camber.
Final words, make sure the OEM M3 consumables are on the newer side and drive the car on MDM as hard as you can while keeping the body work shiny.
If you GoPro-ing your session, use external microphone on the rear bumper to truly enjoy the videos and admire your accomplishments.
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