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Rear Diffuser

Adding a more aggressive rear diffuser to your BMW can offer some performance benefits, but is primarily an aesthetic upgrade. BMWs naturally look great from the rear, why not make yours look even better?
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AutoTecknic Dry Carbon Performance Rear Splitter Set - G80 M3 | G82/ G83 M4
AutoTecknic Dry Carbon Performance Rear Splitter Set - G80 M3 | G82/ ...
AUTOTECKNIC - Corporate Logo
T#:14386758
Part#: BM-0045
Ships on Jul 18, 2025
$ 650.00 USD
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$ 650.00 USD
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These rear side-splitters are AutoTecknic's newly released dry carbon fiber product for the G8X M3/ M4 platform. Also known as the rear winglet, they are designed to mount directly onto the rear factory front bumper for a straightforward installation. Manufactured using 100% genuine 3K Twill-Weave (2X2) Pre-Preg Carbon Fiber with our signature autoclave technology, these lower vents are then finished with multiple coatings of high-gloss UV-resistant clear coat. Following the weight-saving principles of motorsport ideals, we utilize the autoclave vacuum forming process to produce this lip with superior strength and fitment. Made from high-quality dry carbon fiber, this product is durable and ready to give your car some more personality!
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AutoTecknic Dry Carbon Motorsport Rear Diffuser - G8x
AutoTecknic Dry Carbon Motorsport Rear Diffuser - G8x
AUTOTECKNIC - Corporate Logo
T#:14452852
Part#: BM-0881
Ships on Jul 18, 2025
$ 895.00 USD
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$ 895.00 USD
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This rear diffuser is AutoTecknic's newly released dry carbon fiber product for the G8X M3/ M4. The diffuser is designed to mount directly onto the lower factory mounting location for a fast and straightforward installation. Manufactured using 100% genuine 3K Twill-Weave (2X2) Pre-Preg Carbon Fiber with our signature autoclave technology, this diffuser is finished with multiple coatings of high-gloss UV-resistant clear coat. Following the weight-saving principles of motorsport ideals, we utilize the autoclave vacuum forming process to produce this diffuser with superior strength and fitment. Change your car's look and satisfy your carbon cravings today!
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Autotecknic Vacuumed Carbon Fiber Diffuser - F30 M-Sport
Autotecknic Vacuumed Carbon Fiber Diffuser - F30 M-Sport
AUTOTECKNIC - Corporate Logo
T#:21407029
Part#: ATK-BM-0400
Ships on Jul 18, 2025
$ 580.00 USD
Free Shipping on orders $49 and up
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$ 580.00 USD
Free Shipping on orders $49 and up
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Carbon fiber is a staple in the performance world and has been incorporated into motorsports since the early 80s. Over time companies have taken it upon themselves to create new carbon products to add to your car that may not have been originally available. Autotecknic is no different. If you're looking for a carbon addition that has been made to the highest standards with premium materials, then Autotecknic's line of carbon additions is your one-stop shop. Made to clip on the factory mounting locations and made from vacuumed carbon fiber, this diffuser is made to be durable and mount easily to your F30, improving your car's look with ease!
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AutoTecknic Dry Carbon Rear Diffuser Trim Set - G80 M3 | G82/ G83 M4
AutoTecknic Dry Carbon Rear Diffuser Trim Set - G80 M3 | G82/ G83 M4 ...
AUTOTECKNIC - Corporate Logo
T#:14419810
Part#: BM-0341
Ships on Jul 18, 2025
$ 600.00 USD
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$ 600.00 USD
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The rear end of your G8X will thank you for this carbon diffuser trim set, giving it a more aggressive and sportier look! Manufactured from the highest-quality dry carbon, this diffuser set is one of the best carbon trim options on the market for your car!
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Spec-D M Sport Black ABS Performance Style Rear Diffuser - 2019-2020 BMW 3 Series G20
Spec-D M Sport Black ABS Performance Style Rear Diffuser - 2019-2020 ...
Spec-D Tuning - Corporate Logo
T#:14684347
Part#: LFRDG2019GBMP-BN
Ships in 7 Business Days
$ 93.99 USD
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$ 93.99 USD
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Brand new in original box Comes with 1 piece M performance style rear diffuser Made of high-quality, black ABS plastic Paintable to match your vehicle Decreases the drag force, improving aerodynamics Gives your vehicle a more aggressive sporty appearance
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HARD Motorsport Rear Diffuser Kit - BMW E90 335i
HARD Motorsport Rear Diffuser Kit - BMW E90 335i
HARD Motorsport - Corporate Logo
T#:390178
Part#: RDIFFUSER.E90
Special Order: No Guaranteed ETA
$ 489.00 USD
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$ 489.00 USD
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To keep wind drag on the rear end of your E90 335i, HARD Motorsport has developed their lightweight Aluminum Rear Diffuser Kit. It reduces undercar drag, allowing for optimal downforce.

Diffuser is unpainted and does not work with stock exhaust. Straight pipes or custom exhaust work recommended.

 

Fits the following vehicles:

2006-2013 E90 BMW 335i 

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AUTOTECKNIC Dry Carbon Performante Rear Diffuser - G87 M2
AUTOTECKNIC Dry Carbon Performante Rear Diffuser - G87 M2
AUTOTECKNIC - Corporate Logo
T#:20979734
Part#: ATK-BM-0888
Ships on Jul 18, 2025
$ 795.00 USD
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$ 795.00 USD
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Looking to change the character of your BMW? This carbon fiber rear diffuser is a great way of getting it done. Carbon fiber means no need to paint, this diffuser will add a beautiful and sporty appearance without being overstated. Constructed of high-quality carbon fiber, this diffuser is sure to impress in every way. Made from high-quality dry carbon fiber, this product is durable and ready to give your car some more personality! Made from high-quality dry carbon fiber, this product is durable and ready to give your car some more personality!
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Autotecknic Dry Carbon Extended-Fin Competition Rear Diffuser - F80 M3 | F82/ F83 M4
Autotecknic Dry Carbon Extended-Fin Competition Rear Diffuser - F80 M...
AUTOTECKNIC - Corporate Logo
T#:39261792
Part#: BM-0352-V2
Ships on Jul 18, 2025
New Item
$ 595.00 USD
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$ 595.00 USD
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Whether you're looking to enhance downforce or simply make a bold styling statement, this premium rear diffuser delivers in every aspect.
Competition Center Diffuser - F10 M5
Competition Center Diffuser - F10 M5
AUTOTECKNIC - Corporate Logo
T#:395887
Part#: BM-0350
Ships on Jul 18, 2025
$ 539.99 USD
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$ 539.99 USD
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We developed this center diffuser from carbon fiber to make the rear end of the M5 more functional and add aesthetic appeal. Our center diffuser is made of 100% true vacuumed carbon fiber for the ultimate weight savings, durability and precision fitment.

Includes one rear center diffuser and mounting hardware. Installation is simple and can be accomplished in your own garage - simply line the diffuser up with your rear bumper and mount using the supplied hardware.

This product fits the following BMWs:
F10 M5 

 

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Autotecknic Dry Carbon Extended-Fin Competition Rear Diffuser - G20 3-SERIES
Autotecknic Dry Carbon Extended-Fin Competition Rear Diffuser - G20 3...
Requires M-Performance Rear Valence
AUTOTECKNIC - Corporate Logo
T#:21275575
Part#: ATK-BM-0353
Ships on Jul 18, 2025
$ 500.00 USD
Add to Wish List
$ 500.00 USD
Add to Wish List
Carbon fiber is a staple in the performance world and has been incorporated into motorsports since the early 80s. Over time companies have taken it upon themselves to create new carbon products to add to your car that may have not been originally available. Autotecknic is no different. If you're looking for a carbon addition that has been made to the highest standards with premium materials, then Autotecknic's line of carbon additions is your one-stop shop. Add some carbon to your M-Performance rear valance! Dry carbon fiber's name comes from its manufacturing process. Dry carbon fiber is formed by using a "pre-preg" or impregnated piece of carbon materials. This piece of carbon is first placed into a mold and then into a sealed autoclave to cure properly. This method creates the least amount of waste and forms a lighter version of carbon than the “wet” method. The autoclave vacuuming process of making dry carbon means fewer pinholes and virtually no air pockets in the carbon. Dry carbon is the highest-quality version of carbon fiber products that are produced.
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AUTOTECKNIC Dry Carbon Fiber Performante Rear Diffuser - G42 2-SERIES M-SPORT
AUTOTECKNIC Dry Carbon Fiber Performante Rear Diffuser - G42 2-SERIES...
AUTOTECKNIC - Corporate Logo
T#:21045549
Part#: ATK-BM-0885
Ships on Jul 18, 2025
$ 650.00 USD
Add to Wish List
$ 650.00 USD
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Looking to change the character of your BMW? Carbon fiber means no need to paint, this diffuser will add a beautiful and sporty appearance without being overstated. Constructed of high-quality carbon fiber, this diffuser is sure to impress in every way. This carbon fiber rear diffuser is a great way of getting it done.
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AutoTecknic Dry Carbon Competition Sport Rear Diffuser - F90 M5
AutoTecknic Dry Carbon Competition Sport Rear Diffuser - F90 M5 ...
AUTOTECKNIC - Corporate Logo
T#:14419807
Part#: ATK-BM-0340
Ships on Jul 18, 2025
$ 850.00 USD
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$ 850.00 USD
Add to Wish List
Here's AutoTecknic's newly released Dry Carbon Fiber Competition Sport Rear Diffuser for the F90 M5. It's designed to mount directly onto the lower factory mounting location for a straightforward and swift installation. This AutoTecknic Dry Carbon Competition Sport Rear Diffuser comes with durable, precise, one-piece dry carbon mounting locations. The diffuser is made with our signature autoclave technology for the ultimate lightweight, high durability, and precise fitment. Made from high-quality dry carbon fiber, this product is durable and ready to give your car some more personality!
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Autotecknic Dry Carbon Fiber Competition Rear Diffuser - F90 M5
Autotecknic Dry Carbon Fiber Competition Rear Diffuser - F90 M5 ...
AUTOTECKNIC - Corporate Logo
T#:5189166
Part#: ATK-BM-0354
Ships on Jul 18, 2025
$ 850.00 USD
Add to Wish List
$ 850.00 USD
Add to Wish List
AutoTecknic was established in 2000 and has since become one of the largest manufacturers and distributors of carbon fiber parts and accessories for a wide variety of manufacturers. Autotecknic's dry carbon fiber competition rear center diffuser for the F90 M5. Designed to mount directly onto the lower factory mounting location for a simple and fast installation. The diffuser is made from carbon fiber and is designed for lightness, high durability, and precise fitment. Dry carbon fiber's name also comes from its manufacturing process. Dry carbon fiber is formed by using a "pre-preg" or impregnated piece of carbon materials. This piece of carbon is first placed into a mold, and then into a sealed vacuum (autoclave) to properly cure. This particular method creates the least amount of waste and forms a lighter version of carbon than the “wet” method. The autoclave vacuuming process of making dry carbon means that there are fewer pinholes and virtually no air pockets that form in the carbon. Dry carbon is the highest quality version of carbon fiber products that are produced.
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Dry Cabron Versus Rear Diffuser Kit - F8x M3/M4
Dry Cabron Versus Rear Diffuser Kit - F8x M3/M4
AUTOTECKNIC - Corporate Logo
T#:20946768
Part#: ATK-BM-0342
Ships on Jul 18, 2025
$ 945.00 USD
Add to Wish List
$ 945.00 USD
Add to Wish List
Looking to change the character of your BMW? This carbon fiber rear diffuser is a great way of getting it done. Constructed of high-quality carbon fiber, this diffuser is sure to impress in every way. Carbon fiber means no need to paint, this diffuser will add a beautiful and sporty appearance without being overstated.
Show More Show Less
AutoTecknic Dry Carbon Rear Splitter Set - G87 M2
AutoTecknic Dry Carbon Rear Splitter Set - G87 M2
AUTOTECKNIC - Corporate Logo
T#:39531763
Part#: BM-0811
Ships on Jul 18, 2025
New Item
$ 394.99 USD
Add to Wish List
$ 394.99 USD
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Turner Motorsport offers the AutoTecknic Dry Carbon Rear Splitter Set for the G87 M2, providing BMW owners with a functional and stylish upgrade that enhances both performance and aesthetics.
AutoTecknic Dry Carbon Fiber Side Vent Set - F96 X6M AutoTecknic Dry Carbon Performante Rear Diffuser - G80 M3 | G82/ G83 M4
AutoTecknic Dry Carbon Fiber Side Vent Set - F96 X6M AutoTecknic Dry ...
AUTOTECKNIC - Corporate Logo
T#:14419866
Part#: BM-0880
Ships on Jul 18, 2025
$ 850.00 USD
Add to Wish List
$ 850.00 USD
Add to Wish List
This rear diffuser is AutoTecknic's newly released dry carbon fiber product for the G8X M3/ M4. The diffuser is designed to mount directly onto the lower factory mounting location for a fast and straightforward installation. Manufactured using 100% genuine 3K Twill-Weave (2X2) Pre-Preg Carbon Fiber with our signature autoclave technology, this diffuser is finished with multiple coatings of high-gloss UV-resistant clear coat. Following the weight-saving principles of motorsport ideals, we utilize the autoclave vacuum forming process to produce this diffuser with superior strength and fitment.
Show More Show Less
AutoTecknic Dry Carbon Performante Rear Diffuser - G42 2-Series M-Sport
AutoTecknic Dry Carbon Performante Rear Diffuser - G42 2-Series M-Spo...
AUTOTECKNIC - Corporate Logo
T#:14452863
Part#: BM-0885
Ships on Jul 18, 2025
$ 650.00 USD
Add to Wish List
$ 650.00 USD
Add to Wish List
This rear diffuser is AutoTecknic's newly released dry carbon fiber product for the G42. The diffuser is designed to mount directly onto the lower factory mounting location for a fast and straightforward installation. Manufactured using 100% genuine 3K Twill-Weave (2X2) Pre-Preg Carbon Fiber with our signature autoclave technology, this diffuser is finished with multiple coatings of high-gloss UV-resistant clear coat. Following the weight-saving principles of motorsport ideals, we utilize the autoclave vacuum forming process to produce this diffuser with superior strength and fitment.a
Show More Show Less
Autotecknic Dry Carbon Competition Center Diffuser - F10 M5
Autotecknic Dry Carbon Competition Center Diffuser - F10 M5
AUTOTECKNIC - Corporate Logo
T#:21407063
Part#: ATK-BM-0350
Ships on Jul 18, 2025
$ 540.00 USD
Free Shipping on orders $49 and up
Add to Wish List
$ 540.00 USD
Free Shipping on orders $49 and up
Add to Wish List
Carbon fiber is a staple in the performance world and has been incorporated into motorsports since the early 80s. Over time companies have taken it upon themselves to create new carbon products to add to your car that may not have been originally available. Autotecknic is no different. If you're looking for a carbon addition that has been made to the highest standards with premium materials, then Autotecknic's line of carbon additions is your one-stop shop. Give your M5 a more aggressive appearance with this dry carbon fiber diffuser! This carbon fiber center diffuser comprises 100% pre-preg dry carbon technology for the ultimate lightweight, high-durability, and precise fitment. Dry carbon fiber's name comes from its manufacturing process. Dry carbon fiber is formed by using a "pre-preg" or impregnated piece of carbon materials. This piece of carbon is first placed into a mold and then into a sealed autoclave to cure properly. This method creates the least amount of waste and forms a lighter version of carbon than the “wet” method. The autoclave vacuuming process of making dry carbon means fewer pinholes and virtually no air pockets in the carbon. Dry carbon is the highest-quality version of carbon fiber products that are produced.
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