The TMS E46M3 Racing Brake Duct Kit (Developed for our Championship winning E46M3's and legal in SCCA's T2 CLASS) our complete kit includes a pair of TMS E46 Carbon Brake Backing Plates, a pair of TMS E46 Carbon Fiber Brake Ducts, two 4' sections of 3" wire reinforced silicone brake ducting hose and four hose clamps. These carefully designed spoiler ducts are shaped like an "accumulator box" -ensuring a huge amount of air to your brakes, they also use a minimal amount of hose, are very lightweight and can be custom trim to fit a variety of E46 configurations. The backing plates fit easily onto the back of the rotor without removal of the hub / wheel bearing. This kit fits the E46M3 or any E46 series with an M3 / M Tech front bumper cover (requires removal of windshield washer reservoir)