Radium Engineering Air Oil Separator - Return Kit

Fitment: 2015-2021 Subaru WRX STI

Part #: 20-0607

Overview

The Radium Engineering Air Oil Separator (AOS) Return Kit is a precision-engineered component designed specifically for Subaru WRX STI models from 2015 to 2021. This kit is an essential upgrade for enthusiasts seeking to maintain engine cleanliness and optimize performance by effectively managing crankcase vapors. It helps prevent oil blow-by from entering the intake system, reducing carbon buildup and ensuring consistent, reliable operation. Whether for daily driving, spirited street use, or competitive motorsport, this AOS kit supports your vehicle’s longevity and performance stability by keeping your intake air clean and free of oil contaminants.

Key Features

This high-quality return kit features a durable construction designed to withstand the demanding conditions of turbocharged engines. Its compact, efficient design integrates seamlessly with your vehicle’s existing systems, providing a reliable solution for oil vapor management. The kit includes all necessary fittings and hardware for straightforward installation, helping you maintain optimal engine health with minimal hassle. Crafted from corrosion-resistant materials, it ensures long-term durability and consistent performance. The Radium AOS Return Kit is an ideal upgrade for those looking to enhance their Subaru WRX STI’s engine cleanliness and reliability.

Construction & Design

The kit features a high-grade, machined aluminum body with precision fittings, designed for durability and corrosion resistance. Its compact design allows for easy integration into the engine bay without interfering with other components, making it suitable for both stock and modified vehicles.

Installation & Fitment

Designed for a direct bolt-on installation, this kit includes all necessary hardware and fittings. Installation should be performed with basic mechanical skills, and it is recommended to verify fitment against your specific vehicle model and configuration before proceeding.

What’s Included

The package includes the Air Oil Separator unit, return line fittings, hoses, and mounting hardware, providing everything needed for a complete installation.