-10%
FRP REAR BUMPER COVER 86 LATE MODEL LH (TE301A-SB03C) Quick View

FRP REAR BUMPER COVER 86 LATE MODEL LH (TE301A-SB03C)

$120.00
$108.00
GPVC_TE301A-SB03C
Diffusers Exterior Styling Tomei
For those of you adding a single exit exhaust system to your vehicle, then you might be interested in this product. On this page,...
-10%
CARBON REAR BUMPER COVER 86/BRZ/FRS EARLY MODEL RH (TE301A-SB03B) Quick View

CARBON REAR BUMPER COVER 86/BRZ/FRS EARLY MODEL RH (TE301A-SB03B)

$120.00
$108.00
GPVC_TE301A-SB03B
Diffusers Exterior Styling Tomei
For those of you adding a single exit exhaust system to your vehicle, then you might be interested in this product. On this page,...
Fabspeed Ferrari F430 Carbon Fiber Rear Diffuser (FS.FER.430.CFRD) Fabspeed Ferrari F430 Carbon Fiber Rear Diffuser (FS.FER.430.CFRD) Quick View

Fabspeed Ferrari F430 Carbon Fiber Rear Diffuser (FS.FER.430.CFRD)

$2,200.95
JRFS_FS.FER.430.CFRD
Diffusers Exterior Styling Fabspeed
Genuine carbon fiber bolt-on replacement or upgrade for the factory rear Ferrari 430 rear bolt-on diffuser. Looks like you have the 430 Scuderia or...
-15%
Ark Performance C-FX Rear Diffuser (CFXD-0700) Ark Performance C-FX Rear Diffuser (CFXD-0700) Quick View

Ark Performance C-FX Rear Diffuser (CFXD-0700)

$1,859.00
$1,580.15
HBGQ_CFXD-0700
Ark Performance Diffusers Exterior Styling
Equip your vehicle with this superior rear diffuser from ARK Performance to reduce aerodynamic drag and maximize downforce which allows for snappy acceleration, astounding...
-14%
Ark Performance C-FX Bumper Quad Tip Diffuser (CFXD-0703) Ark Performance C-FX Bumper Quad Tip Diffuser (CFXD-0703) Quick View

Ark Performance C-FX Bumper Quad Tip Diffuser (CFXD-0703)

$1,061.50
$902.28
HBGQ_CFXD-0703
Ark Performance Diffusers Exterior Styling
Equip your vehicle with this superior rear diffuser from ARK Performance to reduce aerodynamic drag and maximize downforce which allows for snappy acceleration, astounding...
-15%
Ark Performance S-FX Rear Bumper Side Fin (SFRF-0700) Quick View

Ark Performance S-FX Rear Bumper Side Fin (SFRF-0700)

$398.20
$338.47
HBGQ_SFRF-0700
Ark Performance Diffusers Exterior Styling
Transform your vehicle from anonymous to famous with this sleek, aerodynamically designed product from ARK Performance. Blending drastic style with superior function, this top-shelf...
-15%
Ark Performance S-FX Rear Bumper Valence (SFCD-0712) Ark Performance S-FX Rear Bumper Valence (SFCD-0712) Quick View

Ark Performance S-FX Rear Bumper Valence (SFCD-0712)

$1,859.00
$1,580.15
HBGQ_SFCD-0712
Ark Performance Diffusers Exterior Styling
Transform your vehicle from anonymous to famous with this sleek, aerodynamically designed product from ARK Performance. Blending drastic style with superior function, this top-shelf...
-15%
APR Performance Rear Diffuser for 2020-2021 Chevrolet Corvette(AB-288020) APR Performance Rear Diffuser for 2020-2021 Chevrolet Corvette(AB-288020) Quick View

APR Performance Rear Diffuser for 2020-2021 Chevrolet Corvette(AB-288020)

$2,595.00
$2,205.75
BPDQ_AB-288020
APR Performance Diffusers Exterior Styling
Diffusers work in conjunction with other aerodynamic components of a car to help produce downforce.Because a car displaces air as it moves forward, the...
-15%
APR Performance Carbon Fiber Rear Diffuser for 2020-2021 Toyota Supra(AB-330900) Quick View

APR Performance Carbon Fiber Rear Diffuser for 2020-2021 Toyota Supra(AB-330900)

$1,489.00
$1,265.65
BPDQ_AB-330900
APR Performance Diffusers Exterior Styling
Rear Diffuser by APR Performance. APR Performance Rear Diffusers integrate with the rear bumper area to to reduce overall lift and drag. Formed in...
-15%
APR Performance Rear Diffuser Led set (AG-026021) Quick View

APR Performance Rear Diffuser Led set (AG-026021)

$18.00
$15.30
BPDQ_AG-026021
APR Performance Diffusers Exterior Styling
LED Lighting kit for Rear Diffuser Features: Built to take quality to a new level and deliver peak performance Meticulously engineered with top-of-the-line technology...
-15%
APR Performance Rear Diffuser Hardware Pack (AA-100073) Quick View

APR Performance Rear Diffuser Hardware Pack (AA-100073)

$21.00
$17.85
BPDQ_AA-100073
APR Performance Diffusers Exterior Styling
APR provides Rear Diffuser Hardwear Packs for those looking to replace parts. This product is made of high-quality materials to serve you for years...
-15%
APR Performance Rear Diffuser Hardware Pack (AA-100071) Quick View

APR Performance Rear Diffuser Hardware Pack (AA-100071)

$21.00
$17.85
BPDQ_AA-100071
APR Performance Diffusers Exterior Styling
APR provides Rear Diffuser Hardwear Packs for those looking to replace parts. This product is made of high-quality materials to serve you for years...
-15%
APR Performance Carbon Fiber Rear Diffuser (AB-922020) APR Performance Carbon Fiber Rear Diffuser (AB-922020) Quick View

APR Performance Carbon Fiber Rear Diffuser (AB-922020)

$989.00
$840.65
BPDQ_AB-922020
APR Performance Diffusers Exterior Styling
Diffusers work in conjunction with other aerodynamic components of a car to help produce downforce. Because a car displaces air as it moves forward,...
-15%
APR Performance Carbon Fiber Rear Diffuser (AB-921020) APR Performance Carbon Fiber Rear Diffuser (AB-921020) Quick View

APR Performance Carbon Fiber Rear Diffuser (AB-921020)

$989.00
$840.65
BPDQ_AB-921020
APR Performance Diffusers Exterior Styling
Diffusers work in conjunction with other aerodynamic components of a car to help produce downforce. Because a car displaces air as it moves forward,...
-15%
APR Performance Carbon Fiber Rear Diffuser (AB-820620) APR Performance Carbon Fiber Rear Diffuser (AB-820620) Quick View

APR Performance Carbon Fiber Rear Diffuser (AB-820620)

$1,006.00
$855.10
BPDQ_AB-820620
APR Performance Diffusers Exterior Styling
Diffusers work in conjunction with other aerodynamic components of a car to help produce downforce. Because a car displaces air as it moves forward,...
-15%
APR Performance Carbon Fiber Rear Diffuser (AB-820519) APR Performance Carbon Fiber Rear Diffuser (AB-820519) Quick View

APR Performance Carbon Fiber Rear Diffuser (AB-820519)

$1,006.00
$855.10
BPDQ_AB-820519
APR Performance Diffusers Exterior Styling
Diffusers work in conjunction with other aerodynamic components of a car to help produce downforce. Because a car displaces air as it moves forward,...
-15%
APR Performance Carbon Fiber Rear Diffuser (AB-601700) APR Performance Carbon Fiber Rear Diffuser (AB-601700) Quick View

APR Performance Carbon Fiber Rear Diffuser (AB-601700)

$1,489.00
$1,265.65
BPDQ_AB-601700
APR Performance Diffusers Exterior Styling
Diffusers work in conjunction with other aerodynamic components of a car to help produce downforce. Because a car displaces air as it moves forward,...
-15%
APR Performance Carbon Fiber Rear Valance (AB-545050) APR Performance Carbon Fiber Rear Valance (AB-545050) Quick View

APR Performance Carbon Fiber Rear Valance (AB-545050)

$2,347.00
$1,994.95
BPDQ_AB-545050
APR Performance Diffusers Exterior Styling
Diffusers work in conjunction with other aerodynamic components of a car to help produce downforce. Because a car displaces air as it moves forward,...
-15%
APR Performance Carbon Fiber Rear Valance (AB-535050) APR Performance Carbon Fiber Rear Valance (AB-535050) Quick View

APR Performance Carbon Fiber Rear Valance (AB-535050)

$1,829.00
$1,554.65
BPDQ_AB-535050
APR Performance Diffusers Exterior Styling
Diffusers work in conjunction with other aerodynamic components of a car to help produce downforce. Because a car displaces air as it moves forward,...
-15%
APR Performance Carbon Fiber Rear Diffuser (AB-485019) APR Performance Carbon Fiber Rear Diffuser (AB-485019) Quick View

APR Performance Carbon Fiber Rear Diffuser (AB-485019)

$1,057.00
$898.45
BPDQ_AB-485019
APR Performance Diffusers Exterior Styling
Diffusers work in conjunction with other aerodynamic components of a car to help produce downforce. Because a car displaces air as it moves forward,...
-15%
APR Performance Carbon Fiber Rear Diffuser (AB-286020) APR Performance Carbon Fiber Rear Diffuser (AB-286020) Quick View

APR Performance Carbon Fiber Rear Diffuser (AB-286020)

$2,170.00
$1,844.50
BPDQ_AB-286020
APR Performance Diffusers Exterior Styling
Diffusers work in conjunction with other aerodynamic components of a car to help produce downforce. Because a car displaces air as it moves forward,...
-15%
APR Performance Carbon Fiber Rear Diffuser (AB-286019) APR Performance Carbon Fiber Rear Diffuser (AB-286019) Quick View

APR Performance Carbon Fiber Rear Diffuser (AB-286019)

$2,170.00
$1,844.50
BPDQ_AB-286019
APR Performance Diffusers Exterior Styling
Diffusers work in conjunction with other aerodynamic components of a car to help produce downforce. Because a car displaces air as it moves forward,...
-15%
APR Performance Carbon Fiber Rear Diffuser With Undertray (AB-277030) APR Performance Carbon Fiber Rear Diffuser With Undertray (AB-277030) Quick View

APR Performance Carbon Fiber Rear Diffuser With Undertray (AB-277030)

$2,621.00
$2,227.85
BPDQ_AB-277030
APR Performance Diffusers Exterior Styling
Diffusers work in conjunction with other aerodynamic components of a car to help produce downforce. Because a car displaces air as it moves forward,...
-15%
APR Performance Carbon Fiber Rear Diffuser Without Under Tray (AB-277029) APR Performance Carbon Fiber Rear Diffuser Without Under Tray (AB-277029) Quick View

APR Performance Carbon Fiber Rear Diffuser Without Under Tray (AB-277029)

$2,103.00
$1,787.55
BPDQ_AB-277029
APR Performance Diffusers Exterior Styling
Diffusers work in conjunction with other aerodynamic components of a car to help produce downforce. Because a car displaces air as it moves forward,...
-15%
APR Performance Carbon Fiber Rear Diffuser With Undertray (AB-277020) APR Performance Carbon Fiber Rear Diffuser With Undertray (AB-277020) Quick View

APR Performance Carbon Fiber Rear Diffuser With Undertray (AB-277020)

$2,395.00
$2,035.75
BPDQ_AB-277020
APR Performance Diffusers Exterior Styling
Diffusers work in conjunction with other aerodynamic components of a car to help produce downforce. Because a car displaces air as it moves forward,...
-15%
APR Performance Carbon Fiber Rear Diffuser (AB-277019) APR Performance Carbon Fiber Rear Diffuser (AB-277019) Quick View

APR Performance Carbon Fiber Rear Diffuser (AB-277019)

$1,878.00
$1,596.30
BPDQ_AB-277019
APR Performance Diffusers Exterior Styling
Diffusers work in conjunction with other aerodynamic components of a car to help produce downforce. Because a car displaces air as it moves forward,...
-15%
APR Performance Carbon Fiber Rear Diffuser/APR Widebody Kit Bumper Only (AB-262020) Quick View

APR Performance Carbon Fiber Rear Diffuser/APR Widebody Kit Bumper Only (AB-262020)

$989.00
$840.65
BPDQ_AB-262020
APR Performance Diffusers Exterior Styling
Diffusers work in conjunction with other aerodynamic components of a car to help produce downforce. Because a car displaces air as it moves forward,...
-15%
APR Performance Carbon Fiber Rear Diffuser (AB-262019) APR Performance Carbon Fiber Rear Diffuser (AB-262019) Quick View

APR Performance Carbon Fiber Rear Diffuser (AB-262019)

$989.00
$840.65
BPDQ_AB-262019
APR Performance Diffusers Exterior Styling
Diffusers work in conjunction with other aerodynamic components of a car to help produce downforce. Because a car displaces air as it moves forward,...
-10%
1 Quick View

GTHAUS Track Hawk OE Rear Valence for 4x102mm tips Polyurethane for 2012-2015 Jeep Grand Cherokee(JE0110006)

$498.00
$448.20
JPQS_JE0110006
Diffusers Exterior Styling GTHAUS
Meisterschaft Premium exhaust systems utilize traditional and modern styling to create the world's most advanced exhaust system. From the high polish exterior finish to...
-10%
1 Quick View

GTHAUS 4x120 mm Trackhawk tips (Matte Finish Carbon Fiber) Carbon Fiber for 2012-2015 Jeep Grand Cherokee(JE0116002)

$998.00
$898.20
JPQS_JE0116002
Diffusers Exterior Styling GTHAUS
Meisterschaft Premium exhaust systems utilize traditional and modern styling to create the world's most advanced exhaust system. From the high polish exterior finish to...
-10%
1 Quick View

GTHAUS 4x120 mm Trackhawk tips (Gloss Finish Carbon Fiber) Carbon Fiber for 2012-2015 Jeep Grand Cherokee(JE0116001)

$998.00
$898.20
JPQS_JE0116001
Diffusers Exterior Styling GTHAUS
Meisterschaft Premium exhaust systems utilize traditional and modern styling to create the world's most advanced exhaust system. From the high polish exterior finish to...
-10%
1 Quick View

GTHAUS Aero Shield (Dual) Regular X6 5.0i model only Aluminum for 2008-2014 BMW X6(BM2405002)

$598.00
$538.20
JPQS_BM2405002
Diffusers Exterior Styling GTHAUS
Meisterschaft Premium exhaust systems utilize traditional and modern styling to create the world's most advanced exhaust system. From the high polish exterior finish to...
-10%
1 Quick View

GTHAUS Aero Shield Aluminum for 2007-2008 BMW X5(BM2305001)

$598.00
$538.20
JPQS_BM2305001
Diffusers Exterior Styling GTHAUS
Meisterschaft Premium exhaust systems utilize traditional and modern styling to create the world's most advanced exhaust system. From the high polish exterior finish to...
-10%
1 Quick View

GTHAUS Aero Shield (Dual) Carbon Fiber for 2006-2010 BMW M6(BM1406002)

$798.00
$718.20
JPQS_BM1406002
Diffusers Exterior Styling GTHAUS
Meisterschaft Premium exhaust systems utilize traditional and modern styling to create the world's most advanced exhaust system. From the high polish exterior finish to...
-10%
1 Quick View

GTHAUS Aero Shield (Dual) Aluminum for 2006-2010 BMW M6(BM1405003)

$598.00
$538.20
JPQS_BM1405003
Diffusers Exterior Styling GTHAUS
Meisterschaft Premium exhaust systems utilize traditional and modern styling to create the world's most advanced exhaust system. From the high polish exterior finish to...
-10%
1 Quick View

GTHAUS Aero Shield (Dual) Aluminum for 2004-2005 BMW 645Ci(BM1305001)

$398.00
$358.20
JPQS_BM1305001
Diffusers Exterior Styling GTHAUS
Meisterschaft Premium exhaust systems utilize traditional and modern styling to create the world's most advanced exhaust system. From the high polish exterior finish to...
Items 73 to 108 of 154 total

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.

Your cart

×