Rear Diffusers
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- ACC®Polished Stainless Rear Diffusers (052097)Rear Diffusers (052097) by American Car Craft®. Make your prized investment stand out among the crowd by getting this top-grade rear diffuser. With a stylish aerodynamic design, this product will add a unique touch of aggressiveness to...Adds race-inspired looks to your vehicle’s appearanceIncreases air velocity below the car to create downforce$283.45
- ACC®Real Carbon Fiber Rear Diffusers (052099)Rear Diffusers (052099) by American Car Craft®. Make your prized investment stand out among the crowd by getting this top-grade rear diffuser. With a stylish aerodynamic design, this product will add a unique touch of aggressiveness to...Adds race-inspired looks to your vehicle’s appearanceIncreases air velocity below the car to create downforce$539.95
- ACC®Vinyl Carbon Fiber Wrap Rear Diffusers (052098)Rear Diffusers (052098) by American Car Craft®. Make your prized investment stand out among the crowd by getting this top-grade rear diffuser. With a stylish aerodynamic design, this product will add a unique touch of aggressiveness to...Adds race-inspired looks to your vehicle’s appearanceIncreases air velocity below the car to create downforce$329.35
- Air Design®Rear Valance Diffuser (Unpainted) (FO22A18)Rear Valance Diffuser by Air Design®. Air Design's Award Winning Full Body Styling Systems are custom designed, precision engineered and built to meet an unparallel level of refinement and innovation. All parts are carefully developed...Expertly manufactured from the highest grade materialsMade to guarantee exceptional reliability$349.00
- D2S®CompWerks Style Carbon Fiber Rear Diffuser Splitters (P718B-RD-SPL-CF)CompWerks Style Rear Diffuser Splitters by D2S®. This product is made of high-quality materials to serve you for years to come. Designed using state-of-the-art technology and with customers in mind, this product by D2S will last a...Custom high performance styleComes with everything required for installation$1,003.30
- D2S®MC Sport Style Carbon Fiber Rear Diffuser Fins (MAS-GC-DF-CF)MC Sport Style Rear Diffuser Fins (MAS-GC-DF-CF) by D2S®. This product is made of high-quality materials to serve you for years to come. Designed using state-of-the-art technology and with customers in mind, this product by D2S will...Custom high performance styleComes with everything required for installation$1,343.98
- D2S®MC Sport Style Carbon Fiber Rear Diffuser Fins (MAS-GRT-DF-CF)MC Sport Style Rear Diffuser Fins (MAS-GRT-DF-CF) by D2S®. This product is made of high-quality materials to serve you for years to come. Designed using state-of-the-art technology and with customers in mind, this product by D2S will...Custom high performance styleComes with everything required for installation$1,343.98
- D2S®MC Sport Style Fiberglass Rear Diffuser Fins (Painted) (MAS-GC-DF-PAINTED)MC Sport Style Rear Diffuser Fins (MAS-GC-DF-PAINTED) by D2S®. This product is made of high-quality materials to serve you for years to come. Designed using state-of-the-art technology and with customers in mind, this product by D2S...Custom high performance styleComes with everything required for installation$1,003.30
- D2S®MC Sport Style Fiberglass Rear Diffuser Fins (Painted) (MAS-GRT-DF-PAINTED)MC Sport Style Rear Diffuser Fins (MAS-GRT-DF-PAINTED) by D2S®. This product is made of high-quality materials to serve you for years to come. Designed using state-of-the-art technology and with customers in mind, this product by D2S...Custom high performance styleComes with everything required for installation$1,003.30
- D2S®MC Sport Style Fiberglass Rear Diffuser Fins (Unpainted) (MAS-GC-DF-UNPAINTED)MC Sport Style Rear Diffuser Fins (MAS-GC-DF-UNPAINTED) by D2S®. This product is made of high-quality materials to serve you for years to come. Designed using state-of-the-art technology and with customers in mind, this product by D2S...Custom high performance styleComes with everything required for installation$832.96
- D2S®MC Sport Style Fiberglass Rear Diffuser Fins (Unpainted) (MAS-GRT-DF-UNPAINTED)MC Sport Style Rear Diffuser Fins (MAS-GRT-DF-UNPAINTED) by D2S®. This product is made of high-quality materials to serve you for years to come. Designed using state-of-the-art technology and with customers in mind, this product by D2S...Custom high performance styleComes with everything required for installation$832.96
- D2S®Speed Style Carbon Fiber Rear Bumper Skirt with Diffuser (BTC-V3-RS-CF)Speed Style Rear Bumper Skirt with Diffuser (BTC-V3-RS-CF) by D2S®. This product is made of high-quality materials to serve you for years to come. Designed using state-of-the-art technology and with customers in mind, this product by...Custom high performance styleComes with everything required for installation$5,943.16
- D2S®Speed Style Fiberglass Rear Bumper Skirt with Diffuser (Painted) (BTC-V3-RS-PAINTED)Speed Style Rear Bumper Skirt with Diffuser (BTC-V3-RS-PAINTED) by D2S®. This product is made of high-quality materials to serve you for years to come. Designed using state-of-the-art technology and with customers in mind, this product...Custom high performance styleComes with everything required for installation$4,239.76
- D2S®Speed Style Fiberglass Rear Bumper Skirt with Diffuser (Unpainted) (BTC-V3-RS-UNPAINTED)Speed Style Rear Bumper Skirt with Diffuser (BTC-V3-RS-UNPAINTED) by D2S®. This product is made of high-quality materials to serve you for years to come. Designed using state-of-the-art technology and with customers in mind, this...Custom high performance styleComes with everything required for installation$3,728.74
- D2S®Sport Style Carbon Fiber Rear Diffuser Fins (LX-IS-DF-CF)Sport Style Rear Diffuser Fins (LX-IS-DF-CF) by D2S®. This product is made of high-quality materials to serve you for years to come. Designed using state-of-the-art technology and with customers in mind, this product by D2S will last a...Custom high performance styleComes with everything required for installation$1,446.19
- D2S®Sport Style Fiberglass Rear Diffuser Fins (Painted) (LX-IS-DF-PAINTED)Sport Style Rear Diffuser Fins (LX-IS-DF-PAINTED) by D2S®. This product is made of high-quality materials to serve you for years to come. Designed using state-of-the-art technology and with customers in mind, this product by D2S will...Custom high performance styleComes with everything required for installation$1,105.51
- D2S®Sport Style Fiberglass Rear Diffuser Fins (Unpainted) (LX-IS-DF-UNPAINTED)Sport Style Rear Diffuser Fins (LX-IS-DF-UNPAINTED) by D2S®. This product is made of high-quality materials to serve you for years to come. Designed using state-of-the-art technology and with customers in mind, this product by D2S will...Custom high performance styleComes with everything required for installation$935.17
- D2S®Tesoro Style Carbon Fiber Rear Diffuser Fins (MC-F56-RD1-CF)Tesoro Style Rear Diffuser Fins (MC-F56-RD1-CF) by D2S®. This product is made of high-quality materials to serve you for years to come. Designed using state-of-the-art technology and with customers in mind, this product by D2S will last...Custom high performance styleComes with everything required for installation$1,173.64
- D2S®Tesoro Style Fiberglass Rear Diffuser Fins (Painted) (MC-F56-RD1-PAINTED)Tesoro Style Rear Diffuser Fins (MC-F56-RD1-PAINTED) by D2S®. This product is made of high-quality materials to serve you for years to come. Designed using state-of-the-art technology and with customers in mind, this product by D2S will...Custom high performance styleComes with everything required for installation$832.96
- D2S®Tesoro Style Fiberglass Rear Diffuser Fins (Unpainted) (MC-F56-RD1-UNPAINTED)Tesoro Style Rear Diffuser Fins (MC-F56-RD1-UNPAINTED) by D2S®. This product is made of high-quality materials to serve you for years to come. Designed using state-of-the-art technology and with customers in mind, this product by D2S...Custom high performance styleComes with everything required for installation$662.62
- D2S®Tuner Style Carbon Fiber Rear Fog Light Trim (F458-RBFT-CF)Tuner Style Rear Fog Light Trim by D2S®. This product is made of high-quality materials to serve you for years to come. Designed using state-of-the-art technology and with customers in mind, this product by D2S will last a lifetime. It...Custom high performance styleComes with everything required for installation$2,195.68
- Anderson Composites®Gloss Carbon Fiber Exhaust Surround Bezel (AC-ESB14CHC7)Exhaust Surround Bezel by Anderson Composites®. If you want to get the most out of your vehicle, this superior product by Anderson Composites is just what you need. Designed with the utmost care and attention to detail and manufactured...Designed to comply with strict quality standardsManufactured from high-grade materials$647.10
- RKSport®Carbon Fiber Rear Diffuser (40014150)Rear Diffuser (40014150) by RKSport®. An Exhaust Diffuser accelerates the velocity of the airflow underneath the car. At speed, it decreases the pressure under the car with a resulting increase in downforce. Increased downforce helps...Adds to the appearance of your vehicleDesigned to increase downforce and traction$1,603.94
- RKSport®Carbon Fiber Rear Diffuser (18016104)Rear Diffuser by RKSport®. An Exhaust Diffuser accelerates the velocity of the airflow underneath the car. At speed, it decreases the pressure under the car with a resulting increase in downforce. Increased downforce helps improve your...Adds to the appearance of your vehicleDesigned to increase downforce and traction$1,733.99
- RKSport®Carbon Fiber Rear Diffuser (49012004)Rear Diffuser (49012004) by RKSport®. An Exhaust Diffuser accelerates the velocity of the airflow underneath the car. At speed, it decreases the pressure under the car with a resulting increase in downforce. Increased downforce helps...Adds to the appearance of your vehicleDesigned to increase downforce and traction$1,300.49
- RKSport®Fiberglass Dual Rear Filler (Unpainted) (32011005)Dual Rear Filler by RKSport®. This custom Dual Rear Filler Panel will be a great addition to your car, especially if you're upgrading your car to dual exhaust. Why use the stock dual outlet panel when you can have an RKSport designed...Perfect to improve your vehicle’s style and aerodynamicsEngineered to provide ultimate strength and reliability$606.89
- RKSport®Fiberglass Dual Rear Filler (Unpainted) (26012009)Dual Rear Filler by RKSport®. This custom Dual Rear Filler Panel will be a great addition to your car, especially if you're upgrading your car to dual exhaust. Why use the stock dual outlet panel when you can have an RKSport designed...Perfect to improve your vehicle’s style and aerodynamicsEngineered to provide ultimate strength and reliability$520.19
- RKSport®Fiberglass Rear Diffuser (Unpainted) (40014050)Rear Diffuser (40014050) by RKSport®. An Exhaust Diffuser accelerates the velocity of the airflow underneath the car. At speed, it decreases the pressure under the car with a resulting increase in downforce. Increased downforce helps...Adds to the appearance of your vehicleDesigned to increase downforce and traction$693.59
- RKSport®Fiberglass Rear Diffuser (Unpainted) (49012014)Rear Diffuser (49012014) by RKSport®. An Exhaust Diffuser accelerates the velocity of the airflow underneath the car. At speed, it decreases the pressure under the car with a resulting increase in downforce. Increased downforce helps...Adds to the appearance of your vehicleDesigned to increase downforce and traction$693.59
- Aero Function®AF Signature 1 Series Carbon Fiber Conversion Wide Body Rear Diffuser (108024)AF Signature 1 Series Conversion Wide Body Rear Diffuser by Aero Function®. Add aggressive visual style to the lower section of your rear bumper cover with an add-on Rear Diffuser from Aero Function. Contoured to fit perfectly on your...Enhances aerodynamics with contours that reduce airflow dragInstallation can be done with any method of your choice such as double-sided tape or weather stripping adhesive (not included)$427.55$629.00Save $201.45 (32%)
When constructing a race car, no matter whether it’s a purpose built track machine or a modified production vehicle, car builders try to achieve an aerodynamic balance between drag and downforce. Minimizing drag reduces the air resistance encountered by the car, allowing it to go faster. Downforce is necessary so the tires stay firmly planted on the track surface for optimal power delivery, steering and braking. Diffusers, air dams and side skirts combine to increase down force on race cars. If you want to make your machine look like it’s ready for the track, check out our selection of diffusers.
Although some body mods increase drag to create downforce, this tradeoff is necessary for overall vehicle performance. However, there are component choices a builder can make that maximize downforce without creating excessive drag. Such is the case with a rear diffuser. When combined with an air dam and side skirts, a rear diffuser functions to increase the velocity of the air flowing underneath the car and increase downforce and traction at the tires.
According to Bernoulli’s Principle, when the velocity of air increases, its pressure decreases. This means that the air pressure above the car is greater, and this greater pressure exerted downward provides the necessary downforce. Although components like rear wings can also be used to provide downforce, they create much more aerodynamic drag while doing so than a rear diffuser. The diffuser provides the space for the high velocity, low pressure air flow to decelerate and expand at the rear of the vehicle, creating a pressure differential and more downforce. Diffusers also typically have dividers that allow the air flow to transition to the airstream at the back of the car without creating turbulence and drag.
Of course, the above description applies mainly to a car constructed expressly for racing. Such cars usually have smoother undercarriages to facilitate the increased air flow velocity, and they are driven at much higher speeds than are allowable on the highway, so the average street driven car will not realize all of a diffuser’s benefits. But we know that the visual appeal of a custom rear diffuser and aerodynamic body components in general is just as, if not more important to street driven car owners than functionality, which is why we have the extensive selection of diffusers you see on the page before you.
We offer rear diffusers for most popular cars in materials including carbon fiber, aluminum, urethane, fiberglass, fiberglass composite, ABS plastic and stainless steel. Depending on application, some are designed to be a fully custom addition, while others are replacements for the OE diffuser but are manufactured in an upgraded material like carbon fiber. Some applications are designed to be used with specific exhaust systems. And because each of our rear diffusers is carefully designed for a specific model, regardless of your choice you can count on ease of fitment, and an appearance that will command attention and perfectly complement your vehicle’s styling.