Essex Designed AP Racing Radi-CAL Comp Brake Kit - Front CP9660 (04-21 STI)

“Radi-CAL” is a blanket term used to describe AP Racing’s patented asymmetrical brake caliper design. Radi-Cal technology is grounded in Computer Aided Design (CAD) and Finite Element Analysis (FEA), and allows for organic, alien-looking designs that are a radical departure from conventional caliper designs of the past. Radi-CAL's are widely considered the pinnacle of current brake caliper technology. Since their inception in 2007, these revolutionary calipers have amassed a lengthy string of race victories at all levels of professional motorsport, while redefining brake performance expectations. For more details on the design concept and what these calipers have achieved in professional racing.

Complete FRONT Essex Designed AP Racing Radi-CAL Competition Brake Kit for the Subaru WRX STI:

• Features AP Racing CP9660 Radi-CAL six piston calipers
• 355x32mm, 72 vane AP Racing disc
• Eliminates approximately 10 lbs. of unsprung weight from the car's nose
• Every component designed to resist the heat of extended track sessions
• Pistons sized properly to allow for seamless integration with OEM master cylinder and ABS system
• Designed to work with OEM rear brakes