AP Racing Competition Front Kit 325mm - Subaru WRX, STI

The AP Racing by Essex Competition Brake Kit is a front brake upgrade for Subaru Impreza WRX, WRX STI and WRX, 2002-2021. It pairs AP Racing CP8350 racing calipers with 325 x 32mm, 70-vane AP Racing J Hook discs on fully floating aluminum hats, built for track days and competition driving. Fits OEM BBS wheels without a spacer.

Why upgrade

The kit removes about 14 lb of unsprung weight from the front of the car compared with the OEM brakes. Each caliper weighs 4.8 lb without pads, against 8.2 lb for the factory caliper. Each two-piece disc weighs 15.93 lb, compared with 21.8 lb for the original 325mm disc. The caliper takes a 20mm thick pad for long life and heat tolerance. Every component is designed to resist the heat of extended track sessions. Pistons are sized to work seamlessly with the OEM master cylinder and ABS. It works with the OEM rear brakes.

Caliper and disc construction

On the Subaru WRX, STI, the CP8350 caliper mounts radially on a dedicated bracket at 152mm centers with a 44mm offset, with an M10x1.0 inlet thread. Anti-knockback springs behind the caliper pistons limit pad knockback. The anodized caliper finish resists wear and deterioration at high temperatures. Stainless steel caliper hardware gives a long service life even with frequent pad changes. There are no dust boots to burn up at track temperatures. Pads change with one bolt, with no caliper removal. The championship-winning 70-vane AP Racing J Hook discs are fully floating. The discs use anti-knockback, anti-rattle attachment hardware.

Features

• AP Racing CP8350 four-piston calipers
• 325 x 32mm, 70-vane J Hook discs on floating hats
• About 14 lb less unsprung weight
• 20mm thick brake pads
• Pistons sized for the OEM master cylinder and ABS

What's Included

• One pair AP Racing CP8350 racing calipers (now with black AP Racing logos)
• One pair 325x32mm AP Racing CP3870, 70 vane, J Hook racing discs, with fully floating 6061 hard anodized aluminum hats, and attachment hardware
• One pair caliper mounting brackets and hardware
• One pair Spiegler Stainless Steel Brake Lines with abrasion resistant coating
• Detailed installation instructions

Brake pads are not included.

Specifications

Video

Fitment notes

This front kit fits the vehicles in the table below, which we confirmed against two sources using US model years. Essex has confirmed clearance with OEM BBW WRX STI front. Check your wheel with the Essex wheel fitment template before ordering.

Fitment