Mishimoto High-Pressure 1.3 Bar Radiator Cap

Mishimoto High-Pressure 1.3 Bar Radiator Cap | 1.3 Bar Pressure Rating | Cooling System Upgrade

Overview

The Mishimoto High-Pressure 1.3 Bar Radiator Cap is a direct-fit replacement designed to enhance the cooling system performance of various Subaru models. This radiator cap increases the pressure threshold from the stock level to 1.3 bar, allowing your cooling system to operate more efficiently under demanding driving conditions. It is ideal for Subaru enthusiasts who push their vehicles hard, whether on spirited street driving or track days, and want to maintain optimal coolant flow and system integrity.

Engineered specifically for Subaru platforms, this radiator cap features one-way functionality that mirrors the OEM design, ensuring seamless integration and reliable operation. Mishimoto’s attention to detail includes a unique non-directional sticker that guarantees correct orientation during installation. The cap’s robust construction is designed to withstand higher pressures without leaking or failing, making it a dependable upgrade for your Subaru’s cooling system.

By maintaining higher system pressure, the Mishimoto radiator cap raises the boiling point of the coolant, reducing the risk of overheating and coolant loss into the overflow reservoir. This translates to improved thermal management, especially during high-load scenarios common to Subaru WRX, STI, Forester, Legacy, and Impreza models. The direct-fit design ensures a hassle-free installation experience, making it a practical upgrade for Subaru owners seeking enhanced cooling reliability and performance.

Features & Specifications

This Mishimoto High-Pressure Radiator Cap is engineered for a wide range of Subaru models including WRX, STI, Impreza, Forester, Legacy, Outback, and Crosstrek. Featuring a 1.3 bar pressure rating, it is constructed from durable materials to maintain optimal coolant system pressure and prevent coolant loss under high thermal loads.

• Brand: Mishimoto
• Product: High-Pressure 1.3 Bar Radiator Cap
• Part Number: MMRC-13-ONWY
• Fitment: 1998-2001 Impreza, 2002-2003 WRX, 2002-2007 Impreza, 2004-2005 STI, 2004-2005 WRX, 2004-2008 Forester, 2005-2009 Legacy, 2006-2007 WRX, 2008-2010 STI, 2008-2010 WRX, 2008-2016 Impreza, 2009-2013 Forester, 2009-2014 Outback, 2010-2014 Legacy, 2011-2014 STI, 2011-2014 WRX, 2014-2018 Forester, 2015-2021 STI, 2015-2021 WRX, 2017-2022 Crosstrek, 2017-2022 Impreza
• Material: High-grade metal and rubber sealing components
• Finish: Black with non-directional sticker
• Construction: Precision engineered, one-way valve design
• Origin: Manufactured to OEM standards
• Pressure Rating: 1.3 Bar (19 psi)
• Functionality: One-way valve matching OEM operation

Key Benefits

• Performance: Increases cooling system pressure to raise coolant boiling point, reducing overheating risk during high-load driving.
• Reliability: Prevents coolant loss to overflow reservoir by maintaining system integrity under elevated pressures.
• Fitment: Direct OEM-style replacement designed specifically for Subaru vehicles, ensuring perfect fit and function.
• Durability: Constructed with high-quality materials to withstand demanding thermal and pressure conditions.
• Ease of Installation: Non-directional sticker and direct-fit design simplify installation without guesswork.
• Compatibility: Supports a broad range of Subaru models from late 1990s to recent years, covering WRX, STI, Impreza, Forester, Legacy, Outback, and Crosstrek.

What's Included

• 1× Mishimoto High-Pressure 1.3 Bar Radiator Cap
• Installation instructions included

Installation & Compatibility

Installation of the Mishimoto High-Pressure Radiator Cap is straightforward and typically DIY-friendly, requiring no special tools beyond basic hand tools to remove the old cap. Its direct-fit design ensures compatibility with the specified Subaru models without modifications. This upgrade does not require tuning but is recommended for vehicles experiencing elevated cooling demands, such as those with performance modifications or used in aggressive driving scenarios.

• Professional Installation: DIY-Friendly
• Modifications Required: None
• Verify Compatibility: Confirm fitment for your specific Subaru year and model before purchase

Shop with confidence at Subimods—your Subaru parts specialists.