Mugen Carbon Rear Diffuser Honda Civic Type R FL5 23+

Mugen Carbon Rear Diffuser Honda Civic Type R FL5 23+

Mugen’s Group B carbon rear bumper diffuser was shaped using aerodynamic analysis to manage airflow under the FL5 Civic Type R and add rear downforce. An opening at the top lets air trapped inside the bumper escape rearwards, cutting drag.

It is made from carbon fibre, sits approx. 22mm lower than the standard rear diffuser, and is designed to be fitted at the same time as a Mugen sports exhaust. Part of Mugen’s Group B range, developed under its “Extreme R” concept for circuit performance.

Specifications

• Drop: approx. 22mm lower than the standard rear diffuser
• Material: Carbon fibre (CFRP)
• Requires: Mugen sports exhaust or sports titanium exhaust
• Fitting time: approx. 1.5 hours

Key Features

• Diffuser shape from aerodynamic analysis
• Adds rear downforce
• Top opening releases trapped air to reduce drag
• Carbon fibre construction
• Sits approx. 22mm below the standard rear diffuser
• Designed around the Mugen sports exhausts

What’s in the Box?

• Carbon rear bumper diffuser

Required to fit: a Mugen sports exhaust, either the stainless sports exhaust or the sports titanium exhaust.

Fitment

• Honda Civic Type R FL5

Not suitable for: the standard Civic FL (non-Type R), or earlier Civic Type R models such as the FK8 and FK2. Also not suitable for cars with the standard exhaust.

Installation

Mugen quotes approx. 1.5 hours to fit. Important: it is designed to be fitted at the same time as a Mugen sports exhaust and is not intended for the standard exhaust. Professional fitting is recommended.

Do I need the Mugen exhaust?

Yes. Mugen designed the diffuser to be fitted with a Mugen sports exhaust, not the standard system.

Which exhaust version should I choose?

Mugen sells each exhaust with or without a garnish set for the standard rear bumper.

Does it reduce drag?

Yes. Mugen says the top opening lets trapped air escape rearwards, reducing drag.

Part reference

• 84111-XNRC-K1S0

With roots in Japanese motorsport dating back to 1973, Mugen holds a distinctive place in Honda’s performance heritage. Its history in race-engine development and competition shapes a range of performance parts and accessories prized by Honda enthusiasts for their engineering, purposeful design and unmistakable identity.