GSC Exhaust Valves – Audi DAZA/DNWA 2.5L 5-Cylinder

Overview

GSC Power Division Super Alloy Exhaust Valves (Part No. GSC2257-10) are built to meet the demands of high-horsepower turbocharged Audi 2.5L DAZA and DNWA engines. Engineered from high-temperature-resistant super alloy material, these valves deliver enhanced heat tolerance, reduced friction, and improved airflow — making them ideal for motorsport and high-boost applications.

The back-cut valve head promotes efficient exhaust flow and higher RPM potential, while the micro-polished stems ensure smooth valve operation within the guide. Each valve features a hardened tip using a friction-welded process for superior durability under extreme loads.

Key Features

• Back-cut head design improves exhaust flow and performance
• Micro-polished stem minimises oil retention and friction
• Super alloy construction for extreme temperature and boost resistance
• Friction-welded hardened valve tips reduce rocker or tappet wear
• Direct OEM replacement – compatible with triple-groove keepers
• Designed for high-RPM, turbocharged engine environments

Technical Specifications

What's Included

• 1 × GSC Power Division Super Alloy Exhaust Valve (GSC2257-10)

Vehicle Compatibility

• Audi RS3 (8V / 8Y) – 2.5 TFSI DAZA / DNWA
• Audi TT RS (8S) – 2.5 TFSI DAZA

Fitment Note

Compatible with OEM triple-groove keeper/lock systems. For performance applications, GSC recommends replacing valve locks to prevent material grooving and ensure long-term reliability.