OAO Performance Downpipes for Porsche 718 Cayman GT4 RS 4.0L Flat-Six

Unleash the Motorsport Character of the GT4 RS

Developed specifically for the Porsche 718 Cayman GT4 RS equipped with the high-revving 4.0L naturally aspirated flat-six engine, the OAO Performance Downpipes are engineered to improve exhaust gas flow, reduce exhaust restriction, and enhance the raw motorsport character of the GT4 RS.

Designed around the unique performance requirements of the GT4 RS, the OAO downpipes feature optimized internal flow paths, smooth transitions, and high-quality construction to support the high-RPM nature of Porsche's naturally aspirated flat-six.

Manufactured from premium T304 stainless steel with precision TIG welding and performance-oriented engineering, the system is designed to deliver improved flow efficiency, durability, and a more aggressive exhaust character.

Key Features

✓ Designed specifically for Porsche 718 Cayman GT4 RS

✓ 4.0L Naturally Aspirated Flat-Six Engine

✓ High-Flow Performance Downpipes

✓ Optimized Exhaust Gas Flow

✓ Reduced Exhaust Restriction

✓ Premium T304 Stainless Steel Construction

✓ Precision TIG Welding

✓ Mandrel-Bent Tubing

✓ Smooth Internal Transitions

✓ High-Temperature Resistant Construction

✓ Lightweight Performance Design

✓ Direct-Fit Performance Configuration

High-Flow Performance Design

The OAO Performance Downpipes are designed to provide a more efficient exhaust path compared with restrictive factory components.

The optimized design focuses on:

• Increased Exhaust Flow Capacity

• Reduced Exhaust Restriction

• Smooth Gas Transitions

• Optimized Pipe Geometry

• Reduced Internal Turbulence

• Improved High-RPM Exhaust Flow

• High-Temperature Durability

The result is an exhaust system designed to better support the GT4 RS's high-revving naturally aspirated powertrain.

Engineered for the 4.0L Naturally Aspirated Flat-Six

The 718 GT4 RS is powered by Porsche's motorsport-inspired 4.0L naturally aspirated flat-six, a powertrain designed to operate at extremely high engine speeds.

The OAO Performance Downpipes are engineered around this high-RPM application.

Key design considerations include:

• High-Flow Exhaust Routing

• Optimized Exhaust Diameter

• Smooth Collector Transitions

• Reduced Flow Turbulence

• High-Temperature Resistance

• Precision TIG-Welded Construction

• Performance-Oriented Internal Geometry

Every component is designed to complement the naturally aspirated character of the GT4 RS.

Enhanced GT4 RS Exhaust Character

The OAO Performance Downpipes allow the naturally aspirated flat-six to express a more aggressive and motorsport-inspired exhaust character.

Depending on the rest of the exhaust configuration, drivers may experience:

• Stronger Cold Start

• Increased Exhaust Volume

• Sharper Throttle Acoustics

• More Pronounced Flat-Six Tone

• Stronger High-RPM Exhaust Note

• More Aggressive Acceleration Sound

• Enhanced Engine Character

• More Emotional Track-Focused Sound

The high-RPM character of the GT4 RS becomes more pronounced as the engine climbs toward its redline.

Performance Benefits

When combined with an appropriately matched exhaust system and calibration, the OAO Performance Downpipes may provide:

• Improved Exhaust Gas Flow

• Reduced Exhaust Restriction

• Improved High-RPM Breathing

• Sharper Throttle Response

• Enhanced Engine Response

• Stronger Exhaust Sound

• Improved Performance Potential

Actual power gains vary depending on vehicle condition, ECU calibration, exhaust configuration, fuel quality, and other supporting modifications.

Premium T304 Stainless Steel Construction

Manufactured from premium T304 stainless steel to withstand the extreme thermal conditions generated by high-performance driving.

Advantages include:

• Excellent Corrosion Resistance

• High Heat Resistance

• High Structural Strength

• Lightweight Construction

• Precision TIG Welding

• Smooth Internal Surfaces

• CNC-Machined Connections

• Long Service Life

Each OAO downpipe is inspected for dimensional accuracy, weld quality, and overall finish before shipment.

Precision TIG Welding

Every OAO Performance Downpipe is carefully TIG welded to provide:

• Strong Structural Integrity

• Clean Weld Appearance

• Consistent Penetration

• Excellent Heat Resistance

• Long-Term Durability

The precision welding process helps maintain accurate geometry while providing reliable performance under demanding conditions.

Direct-Fit Performance Configuration

The OAO GT4 RS Performance Downpipes are designed around the factory mounting points and exhaust connection architecture.

Installation is intended to minimize unnecessary modification to the vehicle.

Professional installation is strongly recommended to ensure:

• Correct Alignment

• Proper Sealing

• Adequate Clearance

• Secure Mounting

• Proper Exhaust System Operation

Designed for Performance Builds

The OAO GT4 RS Performance Downpipes are an ideal foundation for a more aggressive Porsche exhaust setup.

Compatible upgrades may include:

• OAO Performance Cat-Back Exhaust

• OAO Valvetronic Exhaust System

• High-Flow Exhaust Components

• Performance Air Intake

• ECU Performance Calibration

• Lightweight Performance Components

• Track-Oriented Exhaust Systems

A properly matched exhaust configuration can maximize the benefits of improved exhaust flow.

Vehicle Fitment

Porsche 718 Cayman GT4 RS

• Porsche 718 Cayman GT4 RS

• 4.0L Naturally Aspirated Flat-Six

• High-Performance GT4 RS Platform

Model Years

• 2022

• 2023

• 2024

• 2025

• 2026

Please verify your exact vehicle model, production year, exhaust configuration, and regional specification before ordering.

Not designed for the standard 718 Cayman GT4 unless specifically confirmed.

Not suitable for Porsche 718 GT4 RS models with incompatible factory exhaust configurations. Please confirm fitment before purchase.

Package Includes

• OAO Performance Downpipes

• Exhaust Connection Hardware

• Mounting Hardware

• Clamps / Gaskets where applicable

• Protective Packaging

Installation

Professional installation is recommended.

Installation should be performed by an experienced performance exhaust technician familiar with Porsche 718 GT4 RS vehicles.

After installation, all exhaust connections should be checked for:

• Exhaust Leaks

• Proper Alignment

• Clearance

• Fastener Torque

• Heat Shield Clearance

ECU calibration may be required depending on the final exhaust configuration and emissions equipment retained.

Important ECU & Emissions Notes

Changing exhaust flow characteristics may affect exhaust gas monitoring and ECU behavior.

Depending on the specific downpipe configuration, ECU calibration may be required to optimize vehicle operation and prevent warning lights.

Emissions equipment and catalytic components vary by product configuration. Please verify the exact specification before ordering.

This product is intended for performance, off-road, or motorsport applications where permitted by local regulations.

Always comply with applicable emissions, noise, inspection, and road-use requirements.

Important Notes

Vehicle compatibility can vary according to:

• Model Year

• Regional Specification

• Factory Exhaust Configuration

• Catalytic Configuration

• ECU Calibration

• Existing Aftermarket Exhaust Components

Please provide your vehicle's exact model year and exhaust configuration if fitment confirmation is required.

Performance results and sound characteristics may vary depending on the complete exhaust system and supporting modifications.

Why Choose OAO Performance

OAO Performance specializes in premium exhaust systems and performance components for Porsche, BMW M, Mercedes-AMG, Audi RS, Ferrari, Lamborghini, Jaguar, Land Rover, Aston Martin, Nissan GT-R, Chevrolet Corvette, and other high-performance vehicles.

Every OAO Performance Downpipe combines premium materials, precision TIG welding, optimized exhaust geometry, and rigorous quality control to deliver reliable performance and exceptional craftsmanship.

Upgrade your Porsche 718 Cayman GT4 RS with OAO Performance Downpipes and unlock a more efficient exhaust path, sharper engine response, and a more aggressive high-RPM flat-six soundtrack inspired by Porsche's motorsport heritage.