BMW 5 Series F90 M5 CS Style Carbon Fiber Rear Diffuser (2020+)

Product information from K2 Industries

Manufacturer warranty and guarantee statements below are subject to that manufacturer’s terms. For return eligibility through Lee Mods, see Returns & Exchanges. Ask Lee Mods to clarify any warranty or guarantee before ordering.

CS Style Carbon Fiber Rear Diffuser for BMW M5 F90 (2020+)

Pre-preg dry carbon fiber rear diffuser in CS styling for the F90 M5, inspired by the M5 CS. An aggressive, sculpted design that sharpens the rear end and improves airflow. Available with or without integrated LED brake lights — a direct replacement for the factory diffuser.

Build

• Material: 100% pre-preg dry carbon fiber, vacuum-processed for superior strength and a flawless finish
• Weave: 2x2 twill pattern with distinctive visual depth
• Finish: Gloss clear coat with UV-resistant protection to prevent fading
• Weight: Lightweight construction with an excellent strength-to-weight ratio
• Style: CS-inspired aggressive rear styling

Configuration Options

• With Brake Lights: Integrated LED brake lights for a functional, contemporary look
• Without Brake Lights: Clean, minimalist design that focuses on the carbon fiber aesthetic

Design & Aerodynamics

• Enhanced Airflow: Optimized design channels air more efficiently under the vehicle
• Increased Downforce: Improved rear aerodynamics enhance stability at high speeds
• Aggressive Rear Profile: Sculpted styling for a striking, race-ready presence

Fitment

• 2020+ BMW M5 Sedan (F90)

Package Contents

• 1 x CS Style Carbon Fiber Rear Diffuser

Installation

This diffuser is a direct replacement using the factory mounting points — the rear bumper is removed to fit it, and some heat shield adjustment may be required due to the aggressive CS design. Most installs take around 2–3 hours with standard automotive tools. Intermediate to advanced skill level; professional installation is recommended for the best fitment.

Before You Install

Please inspect the diffuser and confirm the carbon weave, finish, and fitment before installation. If you have a fitment question, contact us with your year and model and we'll help confirm compatibility.