Building a Better FL5: Profiling Seibon Carbon Fiber Civic Upgrades

The 2023+ Civic Type R FL5 is one of the most capable hot hatches ever built—but like any enthusiast ride, it leaves room to grow. Over the month we've been showing you the ins and outs of the FL5 platform, including its popularity and comparison to previous models. 

We took ours to the next level with a full lineup of Seibon carbon fiber aero parts, and the final product turned out incredible. Every piece installed not only sharpened the look but brought real performance and aero enhancements along for the ride. Here’s the full breakdown of what we added and why it matters.

Shop Honda Civic FL5 Chassis Parts!

MB-Style Carbon Fiber Rear Spoiler (RS23HDCVRC-MB)

First up—arguably the most aggressive visual change we made. The MB-style rear spoiler from Seibon dials up the presence of the FL5 in a big way. Crafted from high-quality carbon fiber, it’s more than just a flex piece—this wing actually generates usable rear downforce and sheds weight over stock.

Install Notes:
The fitment was clean with proper brackets and hardware. Once bolted up, the wing felt rigid and track-ready.

Why we love it:

• High-speed stability boost via real downforce
  
  

• Race-inspired silhouette that transforms the rear
  
  

• Lightweight construction with a premium weave and gloss
  
  

MB-Style Rear Diffuser (RD23HDCVR-MB)

To match the aggression of the rear wing, we installed Seibon’s MB-style rear diffuser. It completes the rear-end transformation while adding purposeful aero enhancements. The fins help guide airflow and reduce turbulence underneath the car—something you’ll appreciate during spirited drives or on-track runs.

Install Notes:
The fitment lined up well with the factory bumper. No weird gaps or forced bends—just clean install and instant visual payoff.

Why we love it:

• Functional underbody airflow management
  
  

• Adds depth and detail to the rear profile
  
  

• Matches seamlessly with the MB wing’s design language
  
  

TV-Style Rear Diffuser (HD23HDCVR-TV-DS)

Yes—we installed both rear diffusers during the build process. While the MB diffuser was our final pick, we gave the TV-style variant its time to shine. It features deeper fins and a more aggressive geometry, perfect for anyone wanting a sharper rear aesthetic. Testing both helped us confirm what best matched our overall theme.

Why we love it:

• Bolder, more layered aero look
  
  

• Track-ready visual aggression
  
  

• Great alternative if you want a slightly more sculpted rear
  
  

MB-Style Carbon Fiber Side Skirts (SS23HDCVR-MB)

These side skirts did way more than just fill the visual gap—Seibon’s MB-style carbon side skirts tied the whole build together. The FL5 already has a wide stance, but these skirts lower the visual center of gravity and streamline side airflow for better efficiency.

Install Notes:
We recommend two people for install—lining up carbon parts side-to-side is all about patience. Once on, it’s a whole new look.

Why we love it:

• Smoother side profile + visual drop
  
  

• Directs airflow cleanly around the body
  
  

• Carbon finish adds elite build consistency
  
  

MB & BH-Style Mounting Brackets (SMB23HDCVR & SMB23HDCVR-BH)

To support the rear aero, we installed both MB- and BH-style mounting brackets from Seibon. These aren’t just optional—they’re engineered specifically to pair with Seibon’s carbon wings and provide the structural integrity needed for real-world use. Whether you’re cornering hard or hitting highway speeds, these brackets hold firm.

Install Notes:
Zero flex, no rattle, and all hardware included. Don’t skip these if you’re running a Seibon spoiler—they’re made to work together.

Why we love it:

• Necessary support for carbon wing setups
  
  

• Tracks clean and stays secure under load
  
  

• Maintains long-term aero integrity
  
  

Read More: Type R FL5 vs. FK8

Final Thoughts: Shop Seibon Kits For Your Civic FL5 At MAPerformance

This wasn’t just a carbon flex—it was a full aero enhancement designed to complement the FL5’s raw performance. Seibon gave us form and function in one of the cleanest carbon kits we’ve ever installed. Every piece brought more edge, more confidence, and more reason to stare. If you're building your Civic Type R and want to push the limits of how good it can look and feel—start here.