Exhaust Audi S4 B7 (2004–2008)

The Audi S4 B7 with a 4.2 V8 engine (2005-2009) offers a variety of aftermarket exhaust products primarily made from stainless steel. This includes complete cat-back systems, resonated and non-resonated mufflers, intermediate pipes, race catalytic converters, and custom exhaust systems designed to improve power, torque, and exhaust sound. Typical pipe diameters range from 57 to 76 mm, with quad exit tips from 76 to 100 mm.

Aftermarket exhaust systems for the Audi S4 B7 reduce exhaust back-pressure, which generally results in increased engine power and torque. Improved gas flow helps the engine breathe better, enhancing throttle response and overall driving performance. Additionally, some systems include variable valves allowing for a tailored exhaust sound and driving experience.

Yes, many exhaust products for the Audi S4 B7 are designed for plug & play installation, directly replacing the OEM exhaust components without modifications. Custom options are also available for those seeking specific performance or sound characteristics, often compatible with the original catalytic converters or race catalytic converters for optimized exhaust flow.

• Plug & play cat-back systems
• Direct replacement mufflers
• Customisable valve-controlled exhausts

Installation conditions may vary depending on the product and vehicle model (saloon, avant, cabriolet).

Performance exhaust systems for this model typically use high-grade stainless steel such as inox 304 or inox 409. These materials ensure durability, corrosion resistance, and long-lasting performance under varying driving conditions.

• Stainless steel pipes and mufflers
• High-quality muffler and piping designs for sound and flow
• Corrosion-resistant coatings and finishes

These materials contribute to both the performance and aesthetic appeal of the exhaust system.

Exhaust systems for the Audi S4 B7 can significantly alter the sound from stock to more aggressive or deeper tones. Options include resonated mufflers for a balanced sound or valve-controlled systems allowing the driver to select between quieter touring modes and louder, sportier modes.

• Resonated cat-back systems for a refined deep sound
• Valved mufflers for adjustable sound levels
• Quad exhaust tips for enhanced visual and acoustic impact

Sound tuning is designed to maintain a sporty yet non-intrusive driving experience during cruising or idle.

Many aftermarket exhaust products are designed to comply with emission standards when used with the original or approved performance catalytic converters. Cat-back systems often maintain compatibility with existing catalytic converters to ensure emission adherence. However, it is important to verify local regulations and installation requirements before upgrading your exhaust system.

Some products include high-flow catalytic converters that improve performance while still meeting emission conditions.

• Compatibility with original catalytic converters
• Available race catalytic converters with required certifications
• Designed to maintain or improve emission controls

Always check emission and noise legislation applicable to your vehicle and region.

When choosing an exhaust, consider your priorities like sound preferences, performance gains, material quality, and compliance with regulations. Tailor the product selection to your vehicle model (saloon, avant, or cabriolet) and desired installation type.

• Performance improvement (power and torque)
• Sound character and adjustability
• Material and build quality (stainless steel recommended)
• Compatibility with your car model and catalytic converter
• Installation ease and warranty conditions

Consult professional advice or specific product documentation for precise fitment details and to ensure compliance with local road use laws.

Yes, a well-designed exhaust system reduces back-pressure and improves exhaust gas evacuation, which can enhance engine breathing, resulting in noticeable gains in horsepower and torque throughout the RPM range.

• Improved exhaust flow efficiency
• Reduction in pressure loss
• Enhanced throttle response
• Potential for better fuel efficiency under certain conditions

Performance gains depend on the specific exhaust design and the overall condition of your Audi S4 B7 engine and supporting modifications, if any.