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I want to replace my rotors as I believe they are worn. This will be primarily for street use although i'd like to be able to do the odd 3/4-lap track day at barbs or RAC as well. Pads are QFM A1RM and i'll do the fluid at the same time.

Now my knowledge of differernt rotor types is fairly basic... not interested in buying slotted "because racecar" and I don't believe in buying higher spec than what I'll need em for. Can someone explain to me the difference between these two from DBA?

DBA Subaru WRX STI MY01-05 Brembo "HD Direct" Series Front Rotors (PER PAIR) - Pro Speed Racing

Vs DBA T3 4000's ?

DBA Subaru WRX STI MY01-05 Brembo "T3" 4000 Series Front Rotors (PER PAIR) - Pro Speed Racing

Where's the extra $160 going? or should I just buy OEM from Subaru (anyone know how much they are?
cheers