This StopTech Big Brake Kit for E9X M3 comes in 4 different types of brake disc finishing and 5 different caliper colours. It features -

• Drilled or Slotted 2pc Aerorotors
• 4-piston ST40 forged calipers
• Forged caliper brackets
• Sport pads
• DOT-compliant stainless brake lines

You may also wish to consider the 6-Pot Sport Big Brake Kit. 

Dimensions

Rear Brake Disc: 355 x 32 mm 

Front Brake Disc: 355 x 35 mm 

Aerorotors - The 355mm two-piece Aerorotors are available in slotted or cross-drilled patterns, with or without an anti-corrosion zinc coating. The rotors feature StopTech's patented directional vaning pattern that expels hot air to keep the rotor cool and your braking performance on point. Controlling temperatures is key to braking performance, on or off the track. A StopTech Aerorotor rotor is more than just a place to absorb and store heat - Aerorotors are specifically designed to circulate cooling air and cool the brakes faster. This leads to more consistent braking performance, less heat soak throughout the system, and longer pad life.

ST40 calipers - The 4-piston ST40 calipers in this kit are at the top of their game. StopTech boasts the stiffest calipers on the market - two piece calipers are even stiffer than some single-piece monoblock calipers. It doesn't just look good on paper - a stable and rigid caliper ensures optimum brake pad application and quicker response. It also feels good under your foot. Stable and predicatable braking reinforces driver confidence. StopTech calipers feature forged aluminum construction, center bridge reinforcement for added strength, vehicle-specific piston sizes matched to the master cylinder for optimum brake balance, and high-temp silicone brake boots.

309 Sport pads - StopTech Sport pads are the same compound found in bigger brake kits. They offer strong initial bite and consistent performance through a wide temperature range. While intended as a mildly-aggressive street pad these can also be used for autocross or light track duty. These are a supremely capable street pad with less dust, but more performance, than a stock BMW pad.

DOT-compliant stainless steel brake lines also included!