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Auto Tecknic Diffusers

In automotive terms, a diffuser is a shaped section of the car’s underbody, which improves the vehicle’s aerodynamic properties. This happens by enhancing the transition between the high-velocity airflow underneath the car and the freestream airflow of the ambient atmosphere. In simpler terms, the purpose of a rear diffuser is to reduce air turbulence as your car drives at high speeds.

By decreasing drag, rear diffusers make your car more stable at high speeds and reduce the amount of wind resistance it must overcome. Less wind resistance means that your vehicle will be able to utilize its existing horsepower and torque more efficiently. A rear diffuser also adds style to your car and helps it stand out from the crowd. If you have a rear wing on your car, it also affects the diffuser. When the rear wing is mounted low and close to the diffuser, the low pressure under the wing helps suck air through the diffuser.

As the front of a vehicle slows down the air without a diffuser, this is the ideal place to install an inlet. A splitter is commonly used and serves to increase the amount of downforce (lift inverted) at the front of the car. The airstream is brought to stagnation above the splitter by an air dam, which results in an area of high pressure. Below the splitter, the air is redirected away from the stagnation zone and accelerated, causing the pressure to drop. The decrease in pressure in combination with the high pressure over the splitter area creates downforce. Consequently, the larger the area of the splitter, the more downforce is generated.

Buy online or call us today to place your order! If you don't see what you're looking for, please contact us at 1-480-966-3040. We can help you find the right product for your vehicle to fit both your taste and your needs. 


AutoTecknic is a renowned manufacturer of high quality composite parts for European vehicles. They specialize in carbon fiber and ABS molded products. As an independently owned company, they operate from a stocking warehouse in California which allows them to ship products in a timely manner. Unsurpassed quality and customer satisfaction is there goal. They strive to make their products fashionable and durable. Their name is new, but they’re staff is not, and deeply committed to advancing technology and searching market interests so that they can address changing customer needs.

View all Auto Tecknic Diffusers products

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 Auto Tecknic Vacuumed Carbon Fiber Diffuser BMW F80 M3 15-16 

Model Number: BM-0352   View Price

This is Auto Tecknic newly released Vacuumed Carbon Fiber Diffuser for the F80 M3 and F82 M4. Designed to mount directly into the lower rear factory bumper for a simple and fast installation. This carbon fiber diffuser is made with Auto Tecknic 100% true vacuum technology for the ultimate light-weight, high-durability and precise-fitment. Auto Tecknic Vacuumed Carbon Fiber Diffuser are both highly visible and highly functional. Available in 3K twill weave carbon fiber with a high-gloss finish an...
  
 Auto Tecknic Vacuumed Carbon Fiber Diffuser BMW F82 M4 15-16 

Model Number: BM-0352   View Price

This is Auto Tecknic newly released Vacuumed Carbon Fiber Diffuser for the F80 M3 and F82 M4. Designed to mount directly into the lower rear factory bumper for a simple and fast installation. This carbon fiber diffuser is made with Auto Tecknic 100% true vacuum technology for the ultimate light-weight, high-durability and precise-fitment. Auto Tecknic Vacuumed Carbon Fiber Diffuser are both highly visible and highly functional. Available in 3K twill weave carbon fiber with a high-gloss finish an...
  
 Auto Tecknic Vacuumed Carbon Fiber Competition Center Diffuser BMW F10 M5 12-16 

Model Number: BM-0350   View Price

This is Auto Tecknic newly released Vacuumed Carbon Fiber Competition Center Diffuser for the F10 M5. Designed to mount directly into the lower rear factory bumper for a simple and fast installation. This carbon fiber diffuser is made with Auto Tecknic 100% true vacuum technology for the ultimate light-weight, high-durability and precise-fitment. Auto Tecknic Vacuumed Carbon Fiber Competition Center Diffuser is both highly visible and highly functional. Available in 3K twill weave carbon fiber w...