Velocity Exhausts Porsche 991 GT3 / GT3RS Exhaust System

Porsche 991 GT3 / GT3RS Exhaust System

Built for Porsche's naturally-aspirated 4.0L flat-six, this exhaust system is engineered to match the GT3 and GT3RS's motorsport DNA. The factory system already sounds great — this one removes the last of the restriction and lets the engine sing at full volume, sharpening throttle response and unlocking the raw, race-bred character these cars were built for.

Fitment

• Porsche 991.1 & 991.2 GT3 & GT3RS
• Direct bolt-on system — no cutting or permanent modifications required
• Precision-engineered for OEM mounting points and factory alignment
• Compatible with factory valve control system and drive modes (valved configurations)

Configuration Options

Build your system to match your goals — choose your pipe configuration, add-ons, material, and tip finish at checkout.

• System: F1 Catback, Race Catback, or Street Catback
• Add-On: System only, Headers, or 200 Cell Headers
• Valve Option: Valved or non-valved (varies by configuration)
• Material: Brushed T304 Stainless Steel or Grade 5 Titanium
• Tip Finish: Brushed, Black, Burnt, or Carbon Fiber

Sound Character

The naturally-aspirated flat-six has one of the best factory notes in the industry — this system takes it to a race-car level.

• F1 / Race Catback Design: Sharpens the mid-to-high RPM wail and removes the factory's remaining muffled edge, exposing the flat-six's raw induction and exhaust note.
• Overrun Character: Sharp pops and crackles on lift-off and downshifts, most pronounced with a Headers or 200 Cell Headers upgrade.
• Overall Profile: High-revving, motorsport-pitched tone — closer to a GT3 Cup race car than a street-going 911.

Materials & Engineering

• Available in Brushed T304 stainless steel or aerospace-grade Grade 5 titanium for maximum strength-to-weight ratio
• Titanium configuration offers significant weight reduction vs. OEM exhaust system
• Headers and 200 Cell Headers options for reduced backpressure and increased flow
• Precision TIG-welded for structural integrity and a clean, motorsport-grade finish
• Mandrel-bent tubing ensures optimal exhaust velocity and minimal restriction
• High heat resistance for sustained performance under track conditions

Performance Benefits

• Improved exhaust flow for enhanced horsepower and throttle response
• Reduced system weight for sharper handling and quicker acceleration (titanium configuration)
• Higher-RPM responsiveness suited to the GT3/GT3RS's motorsport-derived powerband
• Enhanced driver engagement through sharper sound and feedback, on-track and off

What's in the Box

• Full exhaust system, built to your selected configuration
• All required clamps, hardware, and gaskets
• Plug-and-play valve integration components (valved configurations)
• Installation guide

Why This System

The GT3 and GT3RS were built as Porsche's most track-focused 911s — but the factory exhaust still holds back the flat-six's full voice. This system removes that ceiling, delivering the sharper, more race-bred soundtrack these cars were always meant to have.

For owners who want their GT3 to sound as extreme as it drives — this is the upgrade that defines it.