The COBB Tuning Air/Oil Separator (AOS) is an essential upgrade for Subaru WRX models from 2015 to 2021. Designed to optimize the crankcase ventilation system, this AOS effectively prevents oil vapors from entering the intake system, which can degrade performance and efficiency over time.
The Subaru FA engine's design includes three vent ports for crank pressure—one on each cylinder head and one on the top of the block. Each port connects to the AOS, allowing for faster and more effective crankcase pressure management, ultimately reducing overall system pressure. With a diameter of 4 inches and a height of 5.75 inches, the AOS provides ample capacity to handle oil without the risk of overfilling.
The innovative snail-shaped bottom design redirects positive crank pressure into a swirling pattern, enhancing oil drainage while efficiently separating oil from air across all venting ports.
The back plate of the AOS features a specialized coolant routing system that ensures the unit maintains the same temperature as the engine. This design maximizes the evaporation of moisture that may accumulate inside the can, preventing water from mixing with the oil and maintaining optimal performance.
For detailed installation instructions, please visit the COBB Tuning Documentation.
By integrating the COBB Tuning Air/Oil Separator into your Subaru WRX, you can significantly improve engine longevity and performance, ensuring your vehicle runs smoothly and efficiently.
⚠ WARNING:
Cancer and Reproductive Harm
https://www.P65Warnings.ca.gov
| Vehicle Make/Model | Year | Trims |
|---|---|---|
| Subaru WRX | 2015-2021 | Premium |
| Subaru WRX | 2015-2021 | Limited |
| Subaru WRX | 2015-2016 | STI |
| Subaru WRX | 2015-2021 | Base |
| Subaru WRX | 2017-2021 | Sport |
| Subaru WRX | 2017-2021 | Sport-tech |
| Subaru WRX | 2018-2021 | CVT |
| Subaru WRX | 2018-2021 | 6 Man |
| Subaru WRX | 2019 | Raui Edition |
| Subaru WRX | 2019-2020 | Sport-tech RS |
| Subaru WRX | 2021 | EyeSight |
COBB Tuning Products, LLC warrants to the original retail purchaser that all components manufactured by COBB Tuning, or sold under the COBB brand, and purchased directly from COBB Tuning or from an Authorized COBB Tuning dealer hold a 12-month limited warranty from the date of purchase against defects in materials and workmanship ("Limited Warranty"). This Limited Warranty extends only to the original retail purchaser of the component. This Limited Warranty is intended to cover components only when they are used in the manner for which they were originally designed. This Limited Warranty is void on all products found to have been used in racing or off-road applications, of any nature whatsoever, and on all products that show evidence of abuse, lack of proper maintenance, improper installation, misapplications, alteration in any way whatsoever from their original design or negligence in the use of COBB Tuning products. This Limited Warranty does not cover normal maintenance or wear items such as belts, brake pad material, clutch disc friction material, and brake rotors. COBB Tuning accepts no responsibility for any special, incidental, or consequential damages or costs or grievances incurred by failure of a COBB Tuning component, including but not limited to labor and shipping costs. All implied warranties shall be limited in duration to the said 12-month warranty period and shall be limited to the express terms and provisions of this Limited Warranty.
PROCEDURES FOR WARRANTY CLAIMS
In the event a problem occurs with a COBB component, please contact COBB Tuning at 866-922-3059 during our normal business hours. When speaking to a customer representative, you will need to have your invoice number on hand. The following steps will then be followed: 1. COBB representative will determine if product will have to be returned to COBB Tuning for inspection. A RMA number will be given to be placed clearly on the shipping label. 2. The retailer or the customer will ship the component in question back to COBB Tuning, including the original sales receipt and a clear description of the exact problem experienced. It is the responsibility of the retailer or the customer to pay for shipping back to COBB Tuning. 3. If COBB finds the component to be defective and within the warranty period, COBB will repair, replace, or issue credit to the customer at COBB's option. Any repaired or replaced product will be returned to the retailer or customer, freight prepaid via ground or by truck. Please note that no replacement warranty parts can be shipped until original parts are returned to COBB tuning for inspection.