STILLEN 2018-2021 Infiniti Q50 Rear Diffuser - Matte Black - KB11241MB

Upgrade the rear of your 2018–2021 Infiniti Q50 with the STILLEN Matte Black Rear Diffuser, designed to eliminate the bland factory look and replace it with race-inspired aggression. Featuring a dual-exit configuration and JGTC-style strakes, this diffuser enhances both aerodynamics and visual impact while maintaining excellent OEM-level fitment.

Constructed from durable urethane, this diffuser is painted matte black from the factory and arrives ready for direct installation, with pre-installed 3M automotive tape—no cutting, drilling, or permanent modification required.

Features & Benefits

• Rear Diffuser – Dual Exit Configuration
• Matches STILLEN Front Splitter for a Cohesive Aero Package
• Race-Inspired Fin / Strake Design
• Excellent OEM Fitment
• Painted Matte Black – Ready for Direct Installation
• Durable Urethane Construction for Daily-Driver Use
• Pre-Installed 3M Automotive Tape (OEM-Grade Adhesive)
• No Cutting or Modification Required – Fully Removable
• Limited Lifetime Warranty

Vehicle Fitment

• 2018–2021 Infiniti Q50 (All Models)

Overview

The STILLEN Matte Black Rear Diffuser is the perfect finishing touch for your Infiniti Q50’s lower rear fascia. The fluid, organic design flows naturally with the body lines of the Q50, while the aggressive race-inspired fins add a bold motorsport aesthetic that demands attention from anyone behind you.

Whether paired with a STILLEN front splitter, carbon fiber exhaust tips, or other aero upgrades, this diffuser completes the bottom profile of the car—turning your “family sedan” into something that looks track-ready and unapologetically aggressive.

Arriving fully painted and installation-ready, this diffuser delivers instant transformation with zero hassle.