Extreme Dimensions Carbon Creations C Speed Style Rear Diffuser 15-21 Subaru WRX STI - Gloss Carbon Fiber | Lightweight 2x2 Twill Carbon | Rear Diffuser

Overview

The Extreme Dimensions Carbon Creations C Speed Style Rear Diffuser is a precision-engineered aerodynamic upgrade designed specifically for the 2015-2021 Subaru WRX STI. Crafted from premium 2x2 twill weave carbon fiber, this one-piece diffuser enhances the rear-end aerodynamics while adding a striking visual upgrade. It is ideal for Subaru enthusiasts seeking to improve both the performance and aesthetics of their WRX STI with a lightweight, track-proven component.

Built with a focus on durability and style, this diffuser features a high-gloss finish with UV protectant to maintain its appearance under harsh sunlight and environmental exposure. The design incorporates a weather-resistant aluminum mesh grille where applicable, providing both functional airflow management and protection. Extreme Dimensions is known for delivering quality aftermarket aero parts that blend form and function, making this diffuser a standout choice for Subaru owners who demand OEM+ quality with a motorsport edge.

By replacing the heavier factory diffuser with this carbon fiber alternative, Subaru WRX STI owners benefit from up to 70% weight savings, contributing to improved vehicle dynamics and responsiveness. The modified aerodynamics help reduce rear lift and enhance stability at higher speeds, making it a practical upgrade for spirited driving and track use. This diffuser complements the aggressive styling of the WRX STI while delivering tangible performance advantages.

Features & Specifications

This Extreme Dimensions Carbon Creations C Speed Style Rear Diffuser is engineered for the 2015-2021 Subaru WRX STI and features a lightweight 2x2 twill weave carbon fiber construction. Constructed from premium carbon fiber with a gloss finish, it delivers significant weight reduction and aerodynamic benefits for Subaru enthusiasts seeking enhanced rear-end performance and style.

• Brand: Extreme Dimensions
• Product: Carbon Creations C Speed Style Rear Diffuser
• Part Number: 115142
• 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 Savings: Up to 70% lighter than OEM
• Additional Features: Weather-resistant aluminum mesh grille (where applicable)
• Warranty: 1 year limited warranty

Key Benefits

• Performance: Reduces rear lift and improves high-speed stability through enhanced aerodynamic design.
• Weight Savings: Up to 70% lighter than the factory diffuser, contributing to better vehicle responsiveness and handling.
• Fitment: Precision fitment tailored for 2015-2021 WRX STI ensures seamless integration without modification.
• Durability: UV protectant gloss finish and weather-resistant mesh provide long-lasting resistance to environmental damage.
• Aesthetics: Gloss carbon fiber weave adds a premium, aggressive look that complements the WRX STI’s sporty styling.
• Quality: Molded carbon fiber construction delivers track-proven strength and performance.

What's Included

• 1× Extreme Dimensions Carbon Creations C Speed Style Rear Diffuser
• Weather-resistant aluminum mesh grille (installed or included where applicable)
• Installation instructions

Installation & Compatibility

Installation of the Carbon Creations C Speed Style Rear Diffuser is generally straightforward for those with basic automotive experience, as it is designed for direct bolt-on fitment to the 2015-2021 Subaru WRX STI. No special tools beyond standard hand tools are typically required. Professional installation is recommended to ensure proper alignment and secure mounting, especially to maintain the integrity of the carbon fiber finish. This diffuser does not require any vehicle modifications or tuning adjustments.

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

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