So, what’s in the box?

The 335i kit is offered with an ST60 6-piston front caliper on either a 380x32mm or 355x32mm rotor. Running something as large as the 380 would lock us into using 19” wheels, so we opted for the smaller 355mm discs that’ll fit behind 18’s. Out back, we have an ST40 4-piston caliper on a 345x28mm rotor. StopTech’s rotors are dubbed AeroRotors, and ours are slotted, but they’re offered cross-drilled and zinc-coated as well. These rotors are patented with curved, airfoil-shaped vanes and an air channel between the discs that widens at the trailing edge of the vanes. The aluminum AeroHats are lighter and have directional stand-offs between the rotor and mounting hat that increase airflow to the hotter (outside) face of the rotor by 15%. This pattern is meant to keep the rotor cool as it spins at speed, exhausting hot air with every rotation. Each kit comes with application-specific hard-anodized 6061-T6-billet aluminum mounting brackets with stainless steel studs. The studs and set screws offer strength and durability, but most of all, since they’re specific to each application, precise and proper fitment is guaranteed, and likewise, so is an easy installation. Being that the 335i isn’t a full track car, we haven’t done anything with brake ducting yet, and truthfully, the design of StopTech’s rotors do a hell of a job keeping the brakes cool, providing consistent performance on track. Ask me how I know!