Porsche 991 GT3 / GT3RS Stainless Steel Valved Race Exhaust System

Porsche 991 GT3 / GT3 RS T304 Stainless Steel Race Exhaust System

Built for drivers who want the rawest expression of Porsche’s 9,000 RPM flat-six, this race-spec exhaust system transforms the 991 GT3 and GT3 RS into a true motorsport machine. Louder, sharper, and significantly more aggressive—this is the upgrade that removes factory limitations and delivers a pure, track-inspired experience.

Pricing

• Catless Race System: $6,299.99
• Catted Race System (High-Flow): $6,899.99

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
• Precision-engineered for OEM mounting points and perfect alignment
• Compatible with factory exhaust valve controls and drive modes

Sound Character

This is where the GT3 becomes truly unfiltered.

• Valves Closed: Noticeably deeper and more present than stock, with a controlled but purposeful tone.
• Valves Open: Full race-derived scream—extreme volume, razor-sharp pitch, and immediate response. Expect violent overrun crackles, crisp upshifts, and a relentless top-end that mirrors a track car.
• Catless Configuration: Maximum intensity and rawness. Unrestricted flow delivers the loudest, most aggressive V8-like bark at low RPM and a piercing flat-six scream at redline.
• Catted Configuration: Retains race-level volume with a slightly smoother, more refined edge—reducing harshness while maintaining an exotic, high-frequency tone.
• Overall Profile: Lightweight, high-energy sound with exceptional clarity and zero compromise—engineered for enthusiasts who want to be heard and felt.

Materials & Engineering

• Constructed from premium T304 stainless steel for superior strength and corrosion resistance
• Precision TIG-welded for structural integrity and a clean, high-end finish
• Mandrel-bent tubing ensures maximum exhaust flow and minimal restriction
• Race-inspired design reduces backpressure for optimal high-RPM performance
• Engineered to withstand extreme heat cycles from aggressive driving and track use
• Integrated valved system retains OEM functionality

Performance Benefits

• Significant increase in exhaust flow for improved horsepower and throttle response
• Reduced backpressure for a more free-revving, responsive engine
• Noticeable weight savings vs. OEM exhaust
• Enhanced driver engagement through sound, feedback, and response

What’s in the Box

• Full T304 stainless steel race exhaust system (mid-pipes + rear section)
• Catless straight-through sections or high-flow catted sections (based on selection)
• 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 with motorsport DNA—but from the factory, they’re still restrained. This race exhaust system removes those boundaries, delivering a raw, uncompromising soundtrack and performance profile that matches the car’s true capability.

For owners who want their GT3 to sound like it belongs on a starting grid—not a showroom floor—this is the system that defines the experience.