Manley Performance Exhaust Components

Fits Subaru WRX 2000–2003 and STi 2004

Part #: 11155-8

Overview

The Manley Race Series valves are high-performance exhaust valves designed specifically for demanding racing applications. Crafted from premium stainless steel, these valves are engineered to withstand the intense conditions of bracket, drag, and oval track racing. They are an ideal upgrade for Subaru WRX and STi engines operating at high RPMs, providing enhanced durability and consistent performance under extreme loads. Whether you’re building a race-ready engine or seeking to improve your vehicle’s response at high speeds, these valves deliver the reliability and precision needed for competitive motorsports.

Key Features

Designed with racing performance in mind, these valves feature:

• Manufactured from high-grade stainless steel for exceptional strength and corrosion resistance
• Precisely engineered to meet the demands of engines operating up to 8000 RPM
• Optimized valve geometry for improved airflow and combustion efficiency
• Robust construction to withstand high thermal and mechanical stresses
• Compatible with high-performance valve springs and retainers for maximum durability

Construction & Design

These valves are meticulously machined from stainless steel, ensuring a perfect fit and long-lasting performance. The precise manufacturing process guarantees consistent dimensions and surface finish, which are critical for optimal sealing and airflow. The design incorporates features that support high RPM operation and thermal stability, making them suitable for aggressive racing environments.

Performance & Response

Engineered to meet the rigorous demands of high-revving engines, these valves help improve exhaust flow and engine response. They support sustained high-RPM operation, contributing to better power delivery and engine efficiency during competitive racing. The durable construction ensures reliable performance even under extreme conditions.

Installation & Fitment

These valves are designed as direct replacements for the stock components in compatible Subaru WRX and STi models from 2000 to 2004. Proper installation requires standard engine disassembly procedures and should be performed by qualified technicians familiar with high-performance engine builds.

What’s Included

The package includes a set of stainless steel exhaust valves tailored for racing applications, ready for installation into your engine. Hardware or additional components are not included and may require separate purchase based on your build needs.

Ideal For

This product is perfect for motorsport enthusiasts, professional racers, and anyone seeking to maximize engine durability and performance at high RPMs in Subaru WRX and STi models.