With a sleek diffuser, your BMW's entire look will be taken to the next level. The Sport diffuser is inspired by the clean, simple lines of the original E46 M3 CSL diffuser to create a unique and subtle piece for the E92 M3. The fins are understated with a curved shape that integrates nicely into the lines of the OEM bumper. The center section includes a sculpted depression that gives the diffuser a more complex appearance. Each diffuser is constructed by hand from 100% carbon fiber and composite materials inside and out. Attention to detail is our number one goal; that's why you'll always get the highest quality possible. Proper fitment is at the top of our list. With smooth mounting surfaces and reinforced bolt holes, your diffuser will stay on and look good for years to come. Not sure which carbon fiber to get? 
Specs:

Dry carbon construction
Flawless fitment
Extremely light and rigid
Dupont clear coated and buffed to a mirror finish