Extreme Dimensions Carbon Creations Empire Rear Diffuser 15-21 Subaru WRX STI - Gloss Carbon Fiber | Gloss Carbon Fiber Finish | Rear Diffuser

Overview

The Extreme Dimensions Carbon Creations Empire Rear Diffuser is a precision-engineered aerodynamic upgrade designed specifically for the 2015-2021 Subaru WRX STI. Crafted from high-quality 2x2 twill weave carbon fiber, this one-piece diffuser enhances the rear-end aerodynamics by managing airflow more efficiently under the vehicle. It is ideal for Subaru enthusiasts looking to improve both the visual appeal and functional performance of their WRX STI with a lightweight, track-proven component.

Built with a focus on strength and durability, this diffuser features a premium gloss finish with UV protectant to maintain its appearance over time. The design incorporates a weather-resistant aluminum mesh grille where applicable, adding both protection and style. Extreme Dimensions applies modified aerodynamics principles to ensure that this diffuser not only looks aggressive but also contributes to improved rear downforce and stability at higher speeds.

For Subaru WRX STI owners, this diffuser offers a significant weight reduction—up to 70% lighter than the OEM factory part—helping to reduce overall vehicle weight and improve handling responsiveness. The combination of carbon fiber construction and aerodynamic refinement makes this diffuser a practical upgrade for street and track use, enhancing the driving experience while maintaining OEM+ quality standards.

Features & Specifications

This Extreme Dimensions Carbon Creations Empire Rear Diffuser is engineered for the 2015-2021 Subaru WRX STI and features a premium gloss 2x2 twill weave carbon fiber construction. Designed to be up to 70% lighter than OEM parts, it delivers enhanced aerodynamic performance and visual impact for Subaru enthusiasts seeking a high-quality rear diffuser upgrade.

• Brand: Extreme Dimensions
• Product: Carbon Creations Empire Rear Diffuser
• Part Number: 117941
• Fitment: 2015-2021 Subaru WRX STI
• Material: 2x2 Twill Weave Carbon Fiber
• Finish: Premium Gloss with UV Protectant
• Construction: One-piece molded carbon fiber
• Origin: Not specified
• Weight Reduction: Up to 70% lighter than OEM
• Additional Features: Weather-resistant aluminum mesh grille (where applicable)
• Warranty: 1 year limited warranty

Key Benefits

• Aerodynamics: Improves rear downforce and airflow management for enhanced high-speed stability.
• Weight Savings: Significantly lighter than OEM, contributing to better handling and responsiveness.
• Durability: Carbon fiber construction with UV protectant finish ensures long-lasting performance and appearance.
• Fitment: Designed specifically for the 2015-2021 WRX STI for a seamless OEM+ installation.
• Protection: Integrated aluminum mesh grille offers weather resistance and debris protection.
• Aesthetics: Gloss carbon fiber weave adds a premium, aggressive look that complements Subaru’s sporty design.

What's Included

• 1× Extreme Dimensions Carbon Creations Empire Rear Diffuser (1-piece)
• Weather-resistant aluminum mesh grille (installed where applicable)
• Installation instructions

Installation & Compatibility

Installation of the Extreme Dimensions Empire Rear Diffuser is generally straightforward for those with basic automotive experience, as it is designed to bolt directly onto the 2015-2021 Subaru WRX STI without modification. No special tools beyond standard hand tools are typically required. Professional installation is recommended for optimal fitment and finish, especially to ensure proper alignment and secure mounting. This diffuser is a direct replacement for the factory rear diffuser and does not require tuning or additional modifications.

• Professional Installation: Recommended for best results
• Modifications Required: None
• Verify Compatibility: Confirm fitment for your specific 2015-2021 WRX STI model year and trim

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