What material are these Manley exhaust valves made from?

These valves are made from Manley's XH-432 XtremeAlloy, a material specifically chosen for its ability to withstand extreme force and heat. They also feature chrome stems and hard tips for added durability.

Are these valves suitable for a stock engine rebuild?

While these valves are built for extreme applications, they can be used in any engine rebuild where enhanced durability and heat resistance are desired. Their improved airflow and combustion features can benefit a wide range of builds.

What is the benefit of swirl polished under head areas?

The swirl polishing on the under-head areas helps to smooth the flow of exhaust gases as they exit the cylinder. This can lead to improved overall engine breathing and performance.

Specifications

Brand: Manley Performance
Part #: 11137-8
UPC: 807298030845

Manley 00-03 Subaru WRX (EJ20) / 04 STi Exhaust 32mm Stainless Extreme Duty Valves

Name: Manley 00-03 Subaru WRX (EJ20) / 04 STi Exhaust 32mm Stainless Extreme Duty Valves
Brand: Manley Performance
SKU: manley-performance-manley-00-03-subaru-wrx-ej20-04-sti-exhaust-32mm-stainless-ex-t14-5543
Price: 596.60 USD
Availability: InStock

$596.60

Only 1 left in stock

Fits 2002-2012 Subaru Impreza. Manley Extreme Duty exhaust valves built for extreme heat and force.

Key Features

Fits 2002-2012 Subaru Impreza and 2005-2006 Saab 9-2X.
Manley Extreme Duty Series exhaust valves are constructed from XH-432 XtremeAlloy for superior heat and force resistance.
Features chrome stems and hard tips for enhanced longevity and wear resistance.
Swirl polished under head areas improve airflow dynamics.
Fully machined combustion faces optimize combustion efficiency.

⚠️ CA WARNING: This product can expose you to chemicals known to the State of California to cause cancer and/or birth defects or other reproductive harm. Learn more

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About this part

Product Details

When you're rebuilding the top end of your 2002-2012 Subaru Impreza WRX or 2004 STI, especially if you're pushing the limits, you need parts that can handle the pressure. This set of Manley Extreme Duty Series exhaust valves is built for those demanding situations. They're made from XH-432 XtremeAlloy, a material known for its exceptional strength and heat resistance, making them ideal for applications that see extreme force and high temperatures.

These valves aren't just about tough material; they're also designed for improved performance. The under-head areas are swirl polished to help smooth airflow, and the combustion faces are fully machined to promote better combustion efficiency. To ensure they stand up to the rigors of high-performance use, they feature chrome stems and hard tips, which add to their longevity and resistance to wear. This means they're built to last through tough conditions and many miles.

If you're working on an engine that needs to perform under extreme conditions, these valves are a solid choice. They are specifically designed to handle the kind of heat and force that can challenge lesser components, giving you confidence in your engine's reliability.