Rear Diffusers

Rear Diffusers - Carbon Fibre & Gloss Black Upgrades for All Performance Platforms

The rear diffuser is one of the most visually and aerodynamically significant upgrades available for any performance car. Positioned at the lowest point of the rear bumper, a well-designed diffuser manages the airflow beneath the car, reduces rear lift at speed and transforms the rear end aesthetic from factory-conservative to purposefully aggressive. At AUTOID, we supply a carefully curated range of rear diffusers for BMW, Volkswagen, Audi, Toyota and other performance platforms – in carbon fibre, gloss black ABS and polyurethane, across a price range that suits every build level.

Rear Diffusers

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  • Toyota GR Supra A90 Mk5 Carbon Fibre Rear Diffuser by Adro (2019+) - AUTOID® - Rear Diffusers - Adro

    Toyota GR Supra A90 Mk5 Carbon Fibre Rear Diffuser by Adro (2019+)

    Toyota GR Supra A90 Mk5 Carbon Fibre Rear Diffuser by Adro (2019+)

    (1)

    $1,856.00
    In stock
  • BMW 1 Series M Sport F40 Single Exit (116i 116d 118i 118d) EVO-1 Gloss Black Rear Diffuser by ZAERO (2019-2024) - AUTOID® - Rear Diffusers - Zaero Design
    Sale

    BMW 1 Series M Sport F40 Single Exit (116i 116d 118i 118d) EVO-1 Gloss Black Rear Diffuser by ZAERO (2019-2024)

    BMW 1 Series M Sport F40 Single Exit (116i 116d 118i 118d) EVO-1 Gloss Black Rear Diffuser by ZAERO (2019-2024)
    $202.00 $224.00
    In stock
  • BMW M135i & M140i F20 F21 LCI EVO-1 Gloss Black Rear Diffuser by ZAERO (2015-2019) - AUTOID® - Rear Diffusers - Zaero Design

    BMW M135i & M140i F20 F21 LCI EVO-1 Gloss Black Rear Diffuser by ZAERO (2015-2019)

    BMW M135i & M140i F20 F21 LCI EVO-1 Gloss Black Rear Diffuser by ZAERO (2015-2019)

    (19)

    $224.00
    In stock
  • VW Golf GTI Mk7.5 EVO-1 Gloss Black Rear Diffuser by ZAERO (2017-2020) - AUTOID® - Rear Diffusers - Zaero Design

    VW Golf GTI Mk7.5 EVO-1 Gloss Black Rear Diffuser by ZAERO (2017-2020)

    VW Golf GTI Mk7.5 EVO-1 Gloss Black Rear Diffuser by ZAERO (2017-2020)

    (10)

    $269.00
    In stock
  • BMW 1 Series & M135i F20 F21 Pre-LCI EVO-1 Gloss Black Rear Diffuser by ZAERO (2011-2015) - AUTOID® - Rear Diffusers - Zaero Design

    BMW 1 Series & M135i F20 F21 Pre-LCI EVO-1 Gloss Black Rear Diffuser by ZAERO (2011-2015)

    BMW 1 Series & M135i F20 F21 Pre-LCI EVO-1 Gloss Black Rear Diffuser by ZAERO (2011-2015)

    (11)

    $224.00
    In stock
  • BMW 2 Series M235i & M240i F22 F23 EVO-1 Gloss Black Rear Diffuser by ZAERO (2014-2019) - AUTOID® - Rear Diffusers - Zaero Design

    BMW 2 Series M235i & M240i F22 F23 EVO-1 Gloss Black Rear Diffuser by ZAERO (2014-2019)

    BMW 2 Series M235i & M240i F22 F23 EVO-1 Gloss Black Rear Diffuser by ZAERO (2014-2019)

    (10)

    $224.00
    In stock
  • BMW M2 & M2 Competition F87 Carbon Fibre Performance Rear Diffuser by FORM (2015-2021) - AUTOID® - Rear Diffusers - FORM Industries

    BMW M2 & M2 Competition F87 Carbon Fibre Performance Rear Diffuser by FORM (2015-2021)

    BMW M2 & M2 Competition F87 Carbon Fibre Performance Rear Diffuser by FORM (2015-2021)

    (13)

    $393.00
    In stock
  • VW Golf GTI Mk7 EVO-1 Gloss Black Rear Diffuser by ZAERO (2013-2017) - AUTOID® - Rear Diffusers - Zaero Design

    VW Golf GTI Mk7 EVO-1 Gloss Black Rear Diffuser by ZAERO (2013-2017)

    VW Golf GTI Mk7 EVO-1 Gloss Black Rear Diffuser by ZAERO (2013-2017)

    (8)

    $269.00
    In stock
  • BMW 1 Series M Sport F20 F21 LCI Single Exit (118i 120i 120d 125i) EVO-1 Gloss Black Rear Diffuser by ZAERO (2015-2019) - AUTOID® - Rear Diffusers - Zaero Design

    BMW 1 Series M Sport F20 F21 LCI Single Exit (118i 120i 120d 125i) EVO-1 Gloss Black Rear Diffuser by ZAERO (2015-2019)

    BMW 1 Series M Sport F20 F21 LCI Single Exit (118i 120i 120d 125i) EVO-1 Gloss Black Rear Diffuser by ZAERO (2015-2019)

    (14)

    $224.00
    In stock
  • BMW M135i & 1 Series Dual Exit (128ti, 120d, 120i) F40 EVO-1 Gloss Black Rear Diffuser by ZAERO (2019-2024) - AUTOID® - Rear Diffusers - Zaero Design

    BMW M135i & 1 Series Dual Exit (128ti, 120d, 120i) F40 EVO-1 Gloss Black Rear Diffuser by ZAERO (2019-2024)

    BMW M135i & 1 Series Dual Exit (128ti, 120d, 120i) F40 EVO-1 Gloss Black Rear Diffuser by ZAERO (2019-2024)

    (8)

    $224.00
    In stock
  • BMW M135i & M140i F20 F21 LCI EVO-1 Gloss Black Diffuser Side Spat Flap Extensions by ZAERO (2015-2019) - AUTOID® - Rear Diffusers - Zaero Design

    BMW M135i & M140i F20 F21 LCI EVO-1 Gloss Black Diffuser Side Spat Flap Extensions by ZAERO (2015-2019)

    BMW M135i & M140i F20 F21 LCI EVO-1 Gloss Black Diffuser Side Spat Flap Extensions by ZAERO (2015-2019)

    (6)

    $101.00
    In stock
  • VW Golf GTI Mk8 & Mk8.5 EVO-1 Gloss Black Rear Diffuser by ZAERO (2020+) - AUTOID® - Rear Diffusers - Zaero Design

    VW Golf GTI Mk8 & Mk8.5 EVO-1 Gloss Black Rear Diffuser by ZAERO (2020+)

    VW Golf GTI Mk8 & Mk8.5 EVO-1 Gloss Black Rear Diffuser by ZAERO (2020+)

    (4)

    $269.00
    In stock
  • BMW M2 G87 Pre-Preg Carbon Fibre Rear Diffuser by FORM (2023+) - AUTOID® - Rear Diffusers - FORM Industries

    BMW M2 G87 Pre-Preg Carbon Fibre Rear Diffuser by FORM (2023+)

    BMW M2 G87 Pre-Preg Carbon Fibre Rear Diffuser by FORM (2023+)

    (3)

    $787.00
    In stock
  • VW Golf R Mk7.5 EVO-1 Gloss Black Rear Diffuser by ZAERO (2017-2020) - AUTOID® - Rear Diffusers - Zaero Design

    VW Golf R Mk7.5 EVO-1 Gloss Black Rear Diffuser by ZAERO (2017-2020)

    VW Golf R Mk7.5 EVO-1 Gloss Black Rear Diffuser by ZAERO (2017-2020)

    (2)

    $224.00
    In stock
  • BMW M2 G87 EVO-S Gloss Black Rear Diffuser by ZAERO (2023+) - AUTOID® - Rear Diffusers - Zaero Design

    BMW M2 G87 EVO-S Gloss Black Rear Diffuser by ZAERO (2023+)

    BMW M2 G87 EVO-S Gloss Black Rear Diffuser by ZAERO (2023+)

    (6)

    $337.00
    In stock
  • BMW G80 G81 M3 & G82 G83 M4 Pre-Preg Carbon Fibre Rear Diffuser by FORM (2021+) - AUTOID® - Rear Diffusers - FORM Industries

    BMW G80 G81 M3 & G82 G83 M4 Pre-Preg Carbon Fibre Rear Diffuser by FORM (2021+)

    BMW G80 G81 M3 & G82 G83 M4 Pre-Preg Carbon Fibre Rear Diffuser by FORM (2021+)
    $731.00
    In stock
  • BMW M3 F80 & M4 F82 F83 Carbon Fibre Rear Diffuser by FORM (2014-2019) - AUTOID® - Rear Diffusers - FORM Industries

    BMW M3 F80 & M4 F82 F83 Carbon Fibre Rear Diffuser by FORM (2014-2019)

    BMW M3 F80 & M4 F82 F83 Carbon Fibre Rear Diffuser by FORM (2014-2019)

    (9)

    $314.00
    In stock
  • BMW M240i G42 ID-01 Carbon Fibre Rear Diffuser by TREVORA (2021+) - AUTOID® - Rear Diffusers - TREVORA

    BMW M240i G42 ID-01 Carbon Fibre Rear Diffuser by TREVORA (2021+)

    Pre-preg

    BMW M240i G42 ID-01 Carbon Fibre Rear Diffuser by TREVORA (2021+)

    (4)

    $708.00
    In stock
  • BMW M235i & M240i F22 F23 Carbon Fibre Rear Diffuser by FORM (2014-2020) - AUTOID® - Rear Diffusers - FORM Industries

    BMW M235i & M240i F22 F23 Carbon Fibre Rear Diffuser by FORM (2014-2020)

    BMW M235i & M240i F22 F23 Carbon Fibre Rear Diffuser by FORM (2014-2020)

    (4)

    $472.00
    In stock
  • BMW M2 G87 Pre-Preg Carbon Fibre TR87 Rear Diffuser by TREVORA (2023+) - AUTOID® - Rear Diffusers - TREVORA

    BMW M2 G87 Pre-Preg Carbon Fibre TR87 Rear Diffuser by TREVORA (2023+)

    Pre-preg

    BMW M2 G87 Pre-Preg Carbon Fibre TR87 Rear Diffuser by TREVORA (2023+)

    (5)

    $956.00

Frequently asked questions
Do rear diffusers actually improve aerodynamics or are they purely cosmetic?

A well-designed, vehicle-specific rear diffuser can produce measurable aerodynamic benefits by managing airflow under the car and reducing rear lift at higher speeds. Diffusers that have been CFD-tested (such as the ADRO X3M LCI diffuser in our range) produce quantified improvements in rear stability. Purely cosmetic diffusers with no proper underbody channel geometry deliver less aerodynamic benefit but still provide significant visual enhancement.
What material options are available for rear diffusers?

We offer rear diffusers in pre-preg carbon fibre (the highest specification - used on ADRO products), standard CFRP 2x2 weave carbon and high-quality ABS plastic in gloss black. Pre-preg is the lightest and most visually refined option; ABS gloss black provides an accessible, durable alternative at a lower price point.
Will a rear diffuser fit around my aftermarket exhaust?

This depends on the specific diffuser and exhaust tip size/position. Most vehicle-specific diffusers are designed around the OEM exhaust exit point. If you have an aftermarket exhaust with a different tip size, please contact us to confirm clearance before ordering.
How are rear diffusers installed?

Most diffusers in our range bolt directly onto existing mounting points on the rear bumper. No drilling, cutting or permanent modification is required. Installation typically takes 20–45 minutes with basic tools.

Rear Diffusers - Carbon Fibre & Gloss Black Upgrades for All Performance Platforms

The rear diffuser is one of the most visually and aerodynamically significant upgrades available for any performance car. Positioned at the lowest point of the rear bumper, a well-designed diffuser manages the airflow beneath the car, reduces rear lift at speed and transforms the rear end aesthetic from factory-conservative to purposefully aggressive. At AUTOID, we supply a carefully curated range of rear diffusers for BMW, Volkswagen, Audi, Toyota and other performance platforms – in carbon fibre, gloss black ABS and polyurethane, across a price range that suits every build level.

Key Benefits of a Rear Diffuser Upgrade:

  • Improved rear-end aerodynamics - reduces rear lift at higher speeds
  • Dramatic visual transformation of the rear bumper area
  • Carbon fibre options are lightweight, premium and UV-resistant
  • Direct OEM-mount fitment - no modification required
  • Compatible with standard exhaust systems and aftermarket exhaust tips