Seat Ibiza Mk4 (6P) 1.4 TD (75 BHP) - Years of manufacture 2015 > 17. EBC Ultimax Brake Discs - Ultra Quiet Sport Slotted Brake Rotors. EBC Part Number = USR816. The narrower multi-slot design and the progressive angle at which the slots are machined creates a quiet running sport rotor that still has the benefits of removing gas, dirt, water and debris and maintaining parallel pad wear.