COBB Silicone Radiator Hose Kit (B43400-BK) | Subaru WRX 2015-2021 / Forester XT 2014-2018

The COBB Silicone Radiator Hose Kit (B43400-BK) replaces the factory coolant hoses on your 2015–2021 Subaru WRX or 2014–2018 Forester XT with high-durability, multi-layer silicone components designed to withstand elevated temperatures and pressure. This upgrade improves long-term reliability while adding a clean, performance-oriented look to the engine bay.

KEY FEATURES

• Direct-fit multi-layer silicone hoses designed to outperform OEM rubber coolant lines
• Improved heat resistance helps maintain consistent coolant flow under demanding conditions
• Black exterior finish delivers a subtle, OEM-plus appearance in the engine bay
• Reinforced construction resists expansion, cracking, and deterioration common with factory hoses
• Ideal for tuned vehicles, track use, or as a long-life replacement over stock components
• Includes upper and lower radiator hoses along with high-quality clamps

TECHNICAL SPECIFICATIONS

• Multi-layer silicone hose construction engineered for temperature and pressure stability
• Internal reinforcement fibers maintain hose shape under high coolant pressure
• Precision-molded to match OEM routing for quick, straightforward installation
• Compatible with factory and aftermarket radiators
• Includes stainless-steel worm-drive clamps for secure connections

VEHICLE FITMENT

• Subaru WRX 2015–2021
• Subaru Forester XT 2014–2018

COBB delivers proven, data-driven performance solutions engineered to optimize your Subaru with unmatched precision and reliability.