The Subaru WRX STI PCV Valve Hose enables crankcase vapors to be redirected back into the intake stream. This process preserves power and ensures cleaner emissions. This short piece of molded tubing has earned a well-deserved reputation for reliability. The PCV Valve Hose is specially designed to resist heat, vibration, and oil mist, preventing cracking. The PCV Valve Hose is made to fit 2015 through current WRX STI sedans as well as earlier generations that share the EJ engine lineage. It slides onto the crankcase with a molded lip and locks onto the spring-loaded PCV valve with a clamp that is corrosion resistant, making a sealed bridge to prevent vapor leaks that can degrade fuel economy. The rubber core of the hose is reinforced to prevent collapse under high boost, which means when a turbocharger in a Subaru pushes pressure up, the flow through the PCV Valve Hose remains constant. This helps guard against the air-fuel ratio causing a WRX STI to pull hard out of every corner. Fumes that are blown by are returned for reburn, so there are fewer harmful fumes. The end result is fewer deposits in the intake, as well as a cleaner catalytic converter. This prolongs the life of the Subaru emission system, which helps the owner easily pass inspections. The installation process is simplified by having the factory-matched bends traced at the stock bracket points. This prevents the PCV Valve Hose from contacting the hot exhaust parts for improved safety. The durability of Subaru heritage is evident because pressure testing is done according to the WRX STI track requirements for each PCV Valve Hose, and a replacement PCV Valve Hose fits like new. This is a dependable, model-specific, premium performance small conduit that allows the Subaru WRX STI to run stronger, cleaner, and safer on every drive.
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