Mishimoto MMHOSE-SUB-ANC4BK Black Silicone Ancillary Hoses 2004-2007 Subaru WRX

Vehicle Fitment

• 2004-2007 Subaru Impreza WRX STI (GD Chassis; EJ257 2.5L Turbo Flat-4; AWD)
• 2006-2007 Subaru Impreza WRX (GD Chassis; EJ255 2.5L Turbo Flat-4; AWD)

Fitment Notes

• Fits 2.5L turbocharged EJ-series engines only - does not fit 2.0L EJ205 WRX models (2002-2005)
• The bottom expansion tank hose does not fit 2004-2005 STI models due to a larger factory port size
• This kit replaces ancillary hoses only - it is not a complete replacement for every factory hose in the engine bay
• No clamps are included - reuse factory clamps or purchase separately
• Color: Black (BK) - also available in Blue and Red

Features

• Direct OEM replacement fit for 2004-2007 Subaru WRX STI and 2006-2007 WRX 2.5L turbo ancillary hoses
• Dual-layer construction combining high-grade silicone with heat-resistant embedded fibers
• Withstands temperatures up to 330°F - significantly higher than factory rubber hose limits
• Increased pressure tolerance ideal for boosted applications and upgraded turbo setups
• Resists hardening, cracking, and deterioration caused by age, heat cycles, and oil exposure
• Retains all OEM routing and connection points for a clean, hassle-free installation
• Available in black, blue, or red to complement any engine bay build
• Backed by the Mishimoto Lifetime Warranty

Specifications

• Part Number: MMHOSE-SUB-ANC4BK
• Color: Black
• Material: Dual-Layer High-Grade Silicone with Heat-Resistant Embedded Fibers
• Max Temperature: 330°F
• Engine Fitment: EJ257 2.5L Turbo (STI), EJ255 2.5L Turbo (WRX)
• Quantity: Set of 7 Silicone Hoses
• Clamps: Not included
• OEM Part Number References: 99078AA073, 45162AE020

Included Components

• 7x Silicone Ancillary Hoses (application-specific set)

Product Description

The Mishimoto MMHOSE-SUB-ANC4BK is a direct-fit black silicone ancillary hose kit engineered for the 2004-2007 Subaru Impreza WRX STI and 2006-2007 Impreza WRX equipped with the 2.5L turbocharged EJ-series engine. The kit replaces the factory rubber ancillary hoses - which are prone to cracking, hardening, and failure with age and heat exposure - with seven precision-molded silicone hoses built from dual-layer high-grade silicone reinforced with heat-resistant embedded fibers. With a maximum temperature rating of 330°F and improved pressure tolerance, these hoses are well-suited for boosted daily drivers and modified builds alike.

All seven hoses are precision-matched to OEM routing and connection points for a straightforward installation using factory or aftermarket clamps (sold separately). Note that the bottom expansion tank hose does not fit 2004-2005 STI models due to a larger factory port size on those vehicles. Available in black, blue, or red, and backed by the Mishimoto Lifetime Warranty, this ancillary hose kit is a reliable, long-term cooling system upgrade for any GD-chassis WRX or STI owner.