OAO Equal Length Valvetronic Exhaust System for BMW F80 / F82 / F83 M3 / M4 S55 3.0T

Experience the True Sound of the BMW S55

Designed specifically for the BMW F80 M3, F82 M4, and F83 M4 Convertible equipped with the S55 3.0L twin-turbocharged inline-six engine, the OAO Equal Length Valvetronic Exhaust System combines precision equal-length exhaust engineering with intelligent valve control to deliver improved exhaust flow, enhanced acoustic balance, and an unmistakable motorsport-inspired sound.

The equal-length design is engineered to optimize exhaust pulse timing and create a more balanced exhaust note across the S55's firing sequence. Combined with electronically controlled exhaust valves, the system allows drivers to switch between refined street driving and an aggressive high-performance exhaust character.

Manufactured from premium T304 stainless steel with precision TIG welding, mandrel-bent tubing, and high-flow muffler technology, the OAO system is engineered for performance, durability, and OEM-style fitment.

Key Features

✓ Designed for BMW F80 / F82 / F83 M3 / M4

✓ S55 3.0L Twin-Turbocharged Inline-6 Engine

✓ Equal Length Exhaust Design

✓ Electronic Valvetronic Exhaust System

✓ Premium T304 Stainless Steel Construction

✓ High-Flow Performance Muffler

✓ Precision TIG Welded

✓ Mandrel-Bent Tubing

✓ Optimized Exhaust Pulse Distribution

✓ Improved Exhaust Flow Efficiency

✓ Reduced Exhaust Restriction

✓ OEM-Style Direct Bolt-On Fitment

Equal Length Engineering

Optimized Exhaust Pulse Timing

The OAO Equal Length Exhaust System is engineered with carefully matched primary and secondary exhaust tubing lengths to improve exhaust pulse balance.

The optimized exhaust routing helps provide:

• More Consistent Exhaust Pulse Timing

• Improved Cylinder-to-Cylinder Exhaust Balance

• Smoother Exhaust Gas Flow

• Reduced Acoustic Imbalance

• More Refined High-RPM Exhaust Character

• Distinctive Motorsport-Inspired Sound

Unlike conventional unequal-length exhaust configurations, the equal-length design focuses on creating a more balanced and cohesive exhaust note from the S55 engine.

Intelligent Valvetronic Control

Comfort / Quiet Mode

With the exhaust valves closed, the system maintains a more controlled exhaust volume for everyday driving.

Ideal for:

• Daily Commuting

• Highway Cruising

• Long-Distance Driving

• Residential Areas

• Reduced Exhaust Volume

• Comfortable Street Driving

The result is a refined exhaust experience while retaining the performance character of the S55.

Sport / Open Valve Mode

Open the valves and unleash the full character of the S55 twin-turbo inline-six.

Experience:

• Increased Exhaust Volume

• Deeper Low-RPM Tone

• Stronger Turbocharger Acoustics

• Sharper Acceleration Sound

• More Aggressive Gear-Change Acoustics

• Enhanced High-RPM Exhaust Character

• Motorsport-Inspired Sound

The equal-length configuration gives the S55 a more balanced and exotic exhaust character compared with the factory-style exhaust layout.

Performance-Oriented Exhaust Design

The OAO Equal Length Valvetronic Exhaust System is designed to improve exhaust efficiency while maintaining excellent street drivability.

Potential benefits may include:

• Improved Exhaust Gas Flow

• Reduced Exhaust Backpressure

• Sharper Throttle Response

• Enhanced Turbocharger Sound

• Improved High-RPM Breathing

• More Consistent Exhaust Pulse Behavior

• Reduced Exhaust System Weight

• Excellent Compatibility with Performance Downpipes

• Optimized Performance with ECU Tuning

Actual performance gains may vary depending on supporting modifications, downpipe configuration, and ECU calibration.

Enhanced S55 Sound

The BMW S55 engine is famous for its strong turbocharged performance, but the OAO Equal Length design focuses on creating a smoother, more refined, and more motorsport-inspired exhaust character.

Drivers may experience:

• Deeper Cold Start

• Richer Inline-Six Tone

• More Balanced Exhaust Sound

• Stronger Turbocharger Acoustics

• Sharper Throttle Blips

• Enhanced Acceleration Sound

• More Aggressive High-RPM Character

• Reduced Harshness Compared with Conventional Exhaust Layouts

The equal-length design is particularly suited to enthusiasts looking for a more exotic and refined S55 soundtrack.

Motorsport-Inspired Construction

Every OAO exhaust system is engineered using performance-oriented exhaust design principles and premium manufacturing processes.

Engineering highlights include:

• Equal-Length Exhaust Routing

• High-Flow Straight-Through Muffler Design

• Optimized Tubing Diameter

• Smooth Exhaust Gas Transitions

• Precision Valve Integration

• Reduced Internal Turbulence

• Lightweight Performance Construction

• Factory Mounting Compatibility

Every component is designed to balance sound quality, performance, durability, and installation precision.

Premium T304 Stainless Steel

Manufactured from high-quality T304 stainless steel to withstand the extreme temperatures and demanding conditions associated with high-performance turbocharged engines.

Advantages include:

• Excellent Corrosion Resistance

• Superior Heat Resistance

• High Structural Strength

• Lightweight Construction

• Precision TIG Welding

• CNC-Machined Connections

• Long Service Life

• Premium Surface Finish

Every OAO exhaust system undergoes quality inspection before shipment to ensure consistent manufacturing quality and accurate fitment.

Vehicle Fitment

Compatible with:

BMW F80 M3

• M3 Sedan

• S55 3.0L Twin-Turbo Inline-6

BMW F82 M4

• M4 Coupe

• S55 3.0L Twin-Turbo Inline-6

BMW F83 M4

• M4 Convertible

• S55 3.0L Twin-Turbo Inline-6

Model Years

• 2014

• 2015

• 2016

• 2017

• 2018

• 2019

Please verify your vehicle model, production year, exhaust configuration, and chassis before ordering.

Package Includes

• OAO Equal Length Valvetronic Exhaust System

• Electronic Valve Control Module

• Wireless Remote Controller

• Exhaust Installation Hardware

• Protective Packaging

Installation

Designed as a direct bolt-on exhaust upgrade utilizing factory mounting locations.

No permanent cutting or welding is required.

Professional installation is highly recommended to ensure correct alignment, sealing, and valve operation.

Recommended Performance Setup

For enthusiasts looking for maximum S55 performance and sound, the OAO Equal Length Valvetronic Exhaust System can be combined with:

• OAO S55 Performance Downpipes

• OAO High-Flow Downpipes

• ECU Performance Calibration

• Performance Intake System

• Charge Pipe Upgrade

• Carbon Fiber Exhaust Tips

• Titanium Exhaust Tips

A properly matched exhaust configuration can further enhance the S55's response, sound, and overall driving character.

Important Notes

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

Please verify local emissions and noise regulations before purchasing or installing this product.

Actual sound and performance characteristics may vary depending on downpipes, catalysts, ECU tuning, and other vehicle modifications.

Why Choose OAO Performance

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

Every OAO exhaust system combines advanced engineering, premium materials, precision TIG welding, and rigorous quality control to deliver exceptional fitment, durability, and performance.

Upgrade your BMW F80 M3, F82 M4, or F83 M4 with the OAO Equal Length Valvetronic Exhaust System and experience a smoother, more balanced, and more aggressive S55 soundtrack with the flexibility of intelligent valve control.