Brake pads STOPTECH or DIXCEL
To me it looks like brake pad material on your rotors due to your street pads melting. Slap a new set a cheap pads on there from Autozone or something and drive it for a week or two that material should come off. As long as you don’t have vibration while braking they should still be good. Just make sure to use track pads next time. I personally run StopTech 309 pads because they’re good on track and street
I got Stoptech Sport pads that I've used on track and street for many years.
I run StopTech Sport pads on my E92 M3 and they hold up very well for a dual duty pad. I prefer them over the other options listed.
These are the best double duty brake pad I have tested so far. I have tried stoptech 309 and EBC blue ndx which will start to fade around 4-5 laps at my local track. The dixcel pads I can not get them to fade at all. Pad life seems okay with mix use but street manners are abit worst than the stoptech and EBC (sometimes squeals and dust alot).
For brakes, you're limited to whatever you can fit with your wheels.. I doubt you'd fit Brembo's with them, so you may be limited to 4pot/2pot or just rebuilding your current calipers with good street pads and rotors.
On my WRX, I use Dixcel ES pads front and rear
Upgraded rotors (paragon 2 piece) and dixcel type z pads.
The StopTechs Sports are the better track and street option, I used the front pads in my E46 M3 for 10k+ street miles and a few trackdays. They have good feel and modulation. Just had a little bit of fade towards the end of a 25 minute session.
I’ve been happy with my StopTech Sport pads.
The only difference I noticed with Stoptech is more dust.
Stop tech pads have a lot of brake dust. I had them and hated them. I went with the power stop pads low dust on all four and powerstop drill and slotted rotors up front. I already had stop tech slotted in the rear.
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