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As someone who has been tracking for the past 10+ years, the misconception of "needing a bbk" is the worst among new people. 550whp is not even that much.
The only things you will need for your first track day, is fresh DOT 4 brake fluid (I personally use Motul RBF 660, a lot of others use Castrol SRF, which allows for longer durations between brake flushes due to "wet boiling points"), track/autocross/streetish pads, and tires in decent shape.
Those are the big 3 for anyone going on track for the first time. The only reason I went with the f80 brembos on my e90 (full bolt ons + ethanol mix) is to open my options on brake pad choices. But for someone just starting, it will humble you seeing how slow you are on track, and how cars with 1/3 of power will lap you.
As you progress, then you will want better pads and tires that can keep up with those brake pads.
I even track my A90 Supra with just pads and fluids on oem sized brakes.
E9X M3's do just fine tracking with single piston calipers as well as my old S2000.
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