OLM LE Dry Carbon Fiber Rear Diffuser 2015-2021 WRX / STI | Lightweight Aerodynamic Upgrade | Exterior Aero Part

Overview

The OLM LE Dry Carbon Fiber Rear Diffuser is a precision-engineered aerodynamic component designed exclusively for the 2015-2021 Subaru WRX and WRX STI models. This rear diffuser enhances the vehicle's aerodynamic efficiency by managing airflow beneath the rear bumper, reducing drag and improving stability at higher speeds. It is ideal for Subaru enthusiasts seeking both functional performance gains and a refined, aggressive aesthetic upgrade to their factory rear end.

Crafted from 100% genuine dry carbon fiber, this diffuser exemplifies OLM’s commitment to quality and lightweight construction. The dry carbon fiber manufacturing process ensures a superior strength-to-weight ratio compared to traditional wet layup methods, resulting in a durable yet featherlight component. The design philosophy focuses on seamless integration with the WRX/STI’s OEM bumper lines, delivering an OEM+ fitment that maintains factory-level precision and finish.

Beyond visual enhancement, the diffuser contributes to improved fuel economy by optimizing rear airflow and reducing aerodynamic drag. For Subaru owners, this means a subtle but meaningful performance benefit alongside a motorsport-inspired appearance. Installation is straightforward, utilizing supplied adhesive and hardware to mount directly over the existing bumper without modification, preserving the vehicle’s structural integrity and factory styling cues.

Features & Specifications

This OLM LE Dry Carbon Fiber Rear Diffuser is engineered for 2015-2021 Subaru WRX and WRX STI models and features 100% dry carbon fiber construction. Constructed from lightweight yet durable carbon fiber, it delivers aerodynamic efficiency and a sporty OEM+ look for Subaru enthusiasts seeking both form and function.

• Brand: OLM
• Product: LE Dry Carbon Fiber Rear Diffuser 2015-2021 WRX / STI
• Part Number: OLMA.70064.1
• Fitment: 2015-2021 Subaru WRX / WRX STI
• Material: 100% Dry Carbon Fiber
• Finish: Gloss Clear Coat
• Construction: Dry Carbon Fiber Layup
• Origin: Made in USA
• Mounting: Direct bolt-on with supplied adhesive and hardware
• Surface Finish: Glossy OEM+ quality clear coat

Key Benefits

• Aerodynamics: Reduces rear-end drag for improved high-speed stability and fuel efficiency
• Weight Savings: Lightweight dry carbon fiber construction minimizes added mass compared to OEM plastic parts
• Fitment: Precision-engineered for direct installation on 2015-2021 WRX/STI bumpers with no modifications required
• Aesthetics: Aggressive motorsport-inspired styling enhances the rear profile with a subtle OEM+ appearance
• Durability: High-quality clear coat finish protects the carbon fiber weave from UV and environmental damage
• Installation: Includes all necessary hardware and adhesive for a secure, professional fitment

What's Included

• 1× OLM LE Dry Carbon Fiber Rear Diffuser 2015-2021 WRX / STI
• Mounting hardware
• Adhesive tape for secure installation
• Installation instructions

Installation & Compatibility

Installation of the OLM LE Dry Carbon Fiber Rear Diffuser is designed to be straightforward and accessible for enthusiasts with basic tools. The diffuser mounts directly over the factory rear bumper using the supplied adhesive and hardware, eliminating the need for drilling or cutting. While the process is DIY-friendly for those comfortable with body panel work, professional installation is recommended to ensure perfect alignment and secure bonding. No special tools beyond standard hand tools are required.

• Professional Installation: Recommended for best fit and finish
• Modifications Required: None; direct bolt-on with adhesive
• Verify Compatibility: Confirm fitment for your specific 2015-2021 WRX or WRX STI model year

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