Porsche 991 GT3 / GT3RS Stainless Steel Catted Valved Exhaust System

Porsche 991 GT3 / GT3 RS Stainless Steel Catted Exhaust System

Engineered to elevate one of the most iconic high-revving platforms ever built, this stainless steel catted exhaust system unlocks the true voice and performance of the 991 GT3 and GT3 RS—without sacrificing refinement. Sharper, cleaner, and more exotic, this is the perfect balance of raw sound and everyday usability.

Price

$5,899.99

Fitment

• Porsche 911 GT3 (991.1 & 991.2 | 2014–2019)
• Porsche 911 GT3 RS (991.1 & 991.2 | 2016–2019)
• Direct bolt-on installation — no cutting or permanent modifications required
• Designed for precise OEM fitment and alignment
• Fully compatible with factory exhaust valve controls and drive modes

Sound Character

Refined when you need it—ferocious when you don’t.

• Valves Closed: Deep, smooth tone with a refined, controlled presence. Comfortable for street driving with minimal drone.
• Valves Open: High-pitched, motorsport-inspired scream with increased volume and exceptional clarity. Crisp throttle blips, sharp upshifts, and aggressive yet controlled overrun crackles.
• Catted Configuration: Delivers a cleaner, smoother exhaust note compared to catless setups—reducing harshness and rasp while maintaining a strong, exotic tone. Perfect for those who want performance without excessive rawness.
• Overall Profile: Balanced and sophisticated—enhancing the GT3’s signature 9,000 RPM character with a more defined, premium sound.

Materials & Engineering

• Constructed from premium T304 stainless steel for maximum durability and corrosion resistance
• Integrated high-flow catalytic converters for improved emissions flow without excessive restriction
• Precision TIG-welded for strength and a clean, high-end finish
• Mandrel-bent piping ensures smooth airflow and optimal exhaust velocity
• Engineered to reduce backpressure while maintaining ideal exhaust scavenging
• Designed to handle extreme heat from high-revving track use

Performance Benefits

• Increased exhaust flow for improved horsepower and throttle response
• Reduced backpressure for a more efficient, free-revving engine
• Optimized balance of performance and drivability
• Enhanced engine note and driver feedback

What’s in the Box

• Full stainless steel catted exhaust system (high-flow catted sections + rear exhaust)
• Integrated valved muffler assembly
• All required clamps, hardware, and gaskets
• Plug-and-play valve integration components
• Installation guide

Why This System

The 991 GT3 and GT3 RS are engineered for precision and emotion—but the factory exhaust limits their true acoustic potential. This catted system refines and amplifies the experience, delivering a cleaner, more exotic sound while maintaining the usability expected from a high-end performance car.

For enthusiasts who want the perfect blend of aggression, refinement, and engineering integrity—this is the exhaust system that brings the entire package together.