ARP Uprated Head Stud & Nut Kit for Ford Focus RS MK2 | ST225 | RS500 2.5T B5254 Engines. Ford Focus ST 2.5T 5 Cylinder B5254 Engine. Ford Focus RS 2.5T 5 Cylinder B5254 Engine. Ford B5254 Engine. ARP’s product line contains of thousands of part numbers, and has expanded to include virtually every fastener found in an engine and driveline.
