A very popular upgrade for the Focus ST due to the RS clutch being designed to take more power and torque.
Genuine Ford Focus RS MK2 Mondeo MK4 Driveshaft Oil Seal 75MM Drivers Side
BOSCH IRIDIUM SPARK PLUGS x 5 FIT FORD FOCUS RS MK2 / ST225 - FR7NI33
Ford Focus RS MK2 | ST225 | RS500 | CORTECO Sump Plug with Washer
LuK OE Clutch + Flywheel Kit For Ford Focus RS Mk2 and ST225 Upgrade 2.5T
Ford Focus RS MK2 2.5 OE Oil Cooler Kit, Inc Seals & BLACK Oil Cooler Hoses
Spigot Rings (4) 73.1mm to 63.4mm Spacers Hub for Ford Focus RS [Mk2] 08-15