Mercedes-AMG GT / GTS Downpipes – Catted & Decat Performance Exhaust Upgrades

Mercedes-AMG GT / GTS Downpipes – Unleash the Full Potential of the M178 Engine

The Mercedes-AMG GT and GTS are high-performance sports cars powered by the iconic 4.0 V8 BiTurbo M178 engine. While stock performance is already impressive, the restrictive OEM downpipes limit turbo efficiency, airflow, and exhaust sound. Upgrading to a performance Mercedes-AMG GT / GTS downpipe is one of the most effective modifications to gain more power, faster throttle response, and a deeper AMG exhaust tone.

Why Upgrade to a Performance Mercedes GT / GTS Downpipe?

The OEM downpipes are designed to comply with emissions and noise regulations, which restricts exhaust flow and overall performance. Installing a performance downpipe offers numerous benefits:

• +35–80 HP gains on stock turbos.
• +90–140 HP when paired with Stage 2 ECU remapping.
• Faster turbo spool – reduced backpressure improves boost response and drivability.
• Lower exhaust gas temperatures – increases reliability during spirited driving.
• Enhanced AMG exhaust tone – catted provides a refined sporty sound, decat delivers an aggressive motorsport roar.

Types of Mercedes GT / GTS Downpipes

We offer a wide range of Mercedes-AMG GT / GTS downpipes designed for different performance levels and driving styles:

Catted Mercedes GT / GTS Downpipes

Catted downpipes integrate a high-flow sports catalytic converter, ensuring emissions compliance while improving power and exhaust tone. Ideal for road-driven AMG builds.

Decat Mercedes GT / GTS Downpipes

Decat downpipes remove the catalytic converters entirely, providing maximum exhaust flow and performance. Perfect for track-focused AMG builds, dyno tuning, and unrestricted environments.

Material Options: Stainless Steel & Titanium

The choice of material for your Mercedes-AMG GT / GTS downpipe influences durability, weight, and heat resistance:

• Stainless steel downpipes – cost-effective, corrosion-resistant, and durable.
• Titanium downpipes – ultra-lightweight, premium motorsport-grade finish, and superior thermal performance.

Mercedes-AMG GT / GTS Models & Engine Compatibility

Our Mercedes-AMG GT / GTS downpipes are engineered to fit multiple variants equipped with the M178 V8 engine:

• Mercedes-AMG GT Downpipes – optimized for 476 HP versions.
• Mercedes-AMG GTS Downpipes – tailored for 522 HP variants with enhanced tuning potential.
• Mercedes-AMG GT Roadster / GTS Roadster Downpipes – designed for open-top performance models.

Performance Gains with Mercedes GT / GTS Downpipes

Replacing restrictive OEM downpipes with performance GT / GTS downpipes delivers significant performance improvements:

• +35–80 HP from downpipes alone.
• +90–140 HP when paired with Stage 2 ECU tuning.
• Sharper throttle response and increased mid-range torque.
• Enhanced AMG exhaust sound and reduced turbo lag.

Stage 1, Stage 2 & Hybrid Turbo Builds

The Mercedes-AMG GT / GTS responds exceptionally well to tuning with upgraded downpipes:

• Stage 1 – catted downpipe + ECU remap for safe, road-friendly gains.
• Stage 2 – decat downpipe + upgraded intercoolers + custom ECU mapping for maximum AMG performance.
• Hybrid turbos – 3.5-inch downpipes optimized for ultra-high-performance builds exceeding 800 HP.

Choosing the Right Diameter

Choosing the correct pipe diameter ensures optimal power delivery:

• 3.0-inch downpipes – ideal for Stage 1 and Stage 2 builds.
• 3.5-inch downpipes – recommended for hybrid turbo conversions and high-boost AMG builds.

All Mercedes GT / GTS downpipes are designed for direct bolt-on installation with OEM-style fittings and gaskets for perfect fitment.

Build Quality & Engineering

Our performance GT / GTS downpipes are manufactured using motorsport-grade engineering:

• Mandrel-bent tubing ensures unrestricted exhaust flow.
• Precision TIG welding guarantees strength and durability.
• OEM-style flanges and fittings ensure seamless integration.
• Optional ceramic coatings enhance heat resistance and thermal efficiency.

Tuning Potential

Pairing your Mercedes-AMG GT / GTS downpipe with ECU tuning unlocks the full potential of the M178 engine:

• Massive horsepower and torque increases.
• Optimized turbo response and fueling strategies.
• Custom AMG exhaust tone based on catted or decat setup.
• Essential for Stage 2 and Stage 3 AMG tuning projects.

Catted vs Decat – Which Should You Choose?

Your choice depends on your build goals and intended usage:

• Catted downpipes – perfect for street-driven builds seeking emissions compliance and a refined exhaust note.
• Decat downpipes – ideal for track-focused AMG projects demanding maximum exhaust flow and raw power.

Conclusion

Upgrading to a performance Mercedes-AMG GT / GTS downpipe is one of the most effective ways to enhance power, turbo efficiency, and exhaust tone. Whether you choose a catted downpipe for everyday usability or a decat downpipe for ultimate AMG performance, our selection guarantees premium quality, perfect fitment, and proven gains. Transform your GT or GTS today and unleash its full potential.