BMW 5-Series G31 Downpipes – Catted & Decat Performance Exhaust Upgrades

BMW 5-Series G31 Downpipes – Unlock the Full Potential of Your Touring

The BMW 5-Series G31 Touring, introduced in 2017, is the estate version of the G30 platform, combining executive-class comfort with impressive dynamic performance. Available with a wide range of turbocharged petrol and diesel engines, the G31 offers remarkable efficiency and power. However, the restrictive OEM downpipes limit exhaust flow and reduce your engine’s full potential. Upgrading to performance BMW G31 downpipes is one of the most effective modifications to increase horsepower, enhance turbo response, and achieve a sportier exhaust note.

Why Upgrade to Performance BMW G31 Downpipes?

The factory-installed downpipes are designed to comply with emissions and noise regulations, but they restrict exhaust flow and limit turbo efficiency. Installing high-performance BMW 5-Series G31 downpipes provides numerous benefits:

• Increased horsepower and torque – improved exhaust flow reduces backpressure, unlocking hidden performance.
• Faster turbo spool – enjoy quicker throttle response and stronger acceleration.
• Enhanced exhaust tone – catted downpipes deliver a refined, sporty sound, while decat downpipes unleash a raw, motorsport-inspired roar.
• Lower exhaust gas temperatures – improved thermal efficiency helps protect critical components under heavy load.
• Perfect for ECU tuning – essential for Stage 1, Stage 2, and hybrid turbo setups.

Types of BMW 5-Series G31 Downpipes

We offer a complete selection of BMW G31 downpipes designed for different tuning levels, driving styles, and performance goals:

Catted BMW G31 Downpipes

Catted downpipes feature a high-flow sports catalytic converter, combining emissions compliance with improved performance. Perfect for daily-driven cars in regions with emissions testing.

Decat BMW G31 Downpipes

Decat downpipes remove the catalytic converter entirely, maximizing exhaust flow and unleashing peak power. Recommended for track-focused builds or regions without emissions restrictions.

Material Options: Stainless Steel & Titanium

The choice of material significantly impacts performance, durability, and heat resistance:

• Stainless steel downpipes – cost-effective, corrosion-resistant, and suitable for most setups.
• Titanium downpipes – ultra-lightweight, superior thermal properties, and a premium motorsport finish.

Engine Compatibility

Our BMW 5-Series G31 downpipes are compatible with a wide range of petrol and diesel engines:

• BMW 520i G31 Downpipes – optimized for the B48 2.0 turbocharged petrol engine.
• BMW 530i G31 Downpipes – designed for improved flow and performance.
• BMW 540i G31 Downpipes – engineered for the powerful B58 six-cylinder turbo engine.
• BMW M550i G31 Downpipes – tailored solutions for the N63 and S63 V8 twin-turbo engines.
• BMW 520d & 530d G31 Downpipes – high-flow diesel solutions to improve torque and efficiency.
• BMW 540d G31 Downpipes – designed for dual-stage diesel performance enhancements.

Performance Gains with BMW G31 Downpipes

Installing performance BMW G31 downpipes provides instant and measurable improvements. Typical gains include:

• +20–40 HP with the downpipe alone.
• +50–90 HP when paired with Stage 2 ECU tuning.
• Improved torque delivery across the rev range.
• Reduced turbo lag and sharper throttle response.

Choosing the Right Diameter

Choosing the correct downpipe diameter is crucial for achieving the best performance:

• 2.5-inch downpipes – perfect for Stage 1 builds and mildly tuned engines.
• 3-inch downpipes – recommended for Stage 2 tuning, hybrid turbos, and high-boost setups.
• 3.5-inch downpipes – designed for extreme-performance applications such as the M550i or custom big-turbo builds.

All our BMW G31 downpipes are engineered for direct bolt-on installation, ensuring perfect fitment without cutting or welding.

Build Quality & Engineering

Our performance BMW G31 downpipes are manufactured using the highest-quality materials and advanced engineering techniques:

• Mandrel-bent tubing ensures smooth, unrestricted exhaust flow.
• Premium stainless steel or lightweight titanium construction.
• Precision TIG welding guarantees maximum durability and leak-free performance.
• OEM-style flanges and fittings for seamless integration.

Tuning Potential

Pairing your BMW G31 downpipes with ECU remapping unlocks their full tuning potential:

• Substantial horsepower and torque gains.
• Optimized boost control and fuel delivery strategies.
• Custom exhaust sound profiles based on catted or decat setups.
• Supports Stage 1, Stage 2, and hybrid turbo applications.

Daily Driving vs Track Builds

For daily-driven builds, catted downpipes offer a perfect balance between performance gains and emissions compliance. For motorsport builds, decat downpipes provide maximum exhaust flow, aggressive sound, and peak power output.

Conclusion

Upgrading your BMW 5-Series G31 Touring with performance downpipes is one of the most effective ways to boost power, improve turbo spool, and enhance exhaust sound. Whether you choose catted for refined street performance or decat for uncompromised track results, our range of BMW G31 downpipes guarantees premium quality, perfect fitment, and proven performance gains. Transform your G31 Touring today.