Fabspeed Porsche GT3 / GT3 RS Titanium Rennsport Muffler (2006-2019)

The ULTIMATE OEM-Style High-Performance Titanium Replacement Muffler for Your GT3

As many GT3 owners know, the OEM mufflers are prone to cracking, breaking, and ultimately failing over time - particularly the factory titanium mufflers found on GT3 RS models. Our goal was to engineer a replacement that not only eliminates these durability concerns but also elevates performance, sound, and overall quality beyond the factory design.

Drawing on more than 30 years of experience engineering exhaust systems for Porsche and other exotic performance vehicles, Fabspeed developed a completely reimagined titanium muffler that delivers exceptional strength, significant weight savings, and superior exhaust flow without compromising the refined character of the GT3.

To maximize performance, we increased the valve-open tubing diameter to 2.75 inches (70 mm) - the optimal size for the naturally aspirated GT3 engine. This provides the ideal balance of low exhaust restriction while maintaining high exhaust gas velocity, preserving the unmistakable high-frequency GT3 exhaust note inspired by the legendary Porsche GT3 Cup race cars.

At the heart of the system is Fabspeed's signature investment-cast X-pipe, engineered to optimize exhaust scavenging by efficiently merging both cylinder banks without introducing unnecessary turbulence or restriction. The result is improved cylinder evacuation, enhanced mid-range torque, and a smoother, more responsive power delivery.

To preserve the refined driving characteristics expected from a GT3, we carefully replicated Porsche's seven-chamber internal muffler architecture. This delivers an exhaust note remarkably close to OEM with the valves closed while remaining completely drone-free - even when paired with catless race headers. With Porsche Sport Exhaust (PSE) activated, the titanium construction and optimized internal flow produce a more aggressive, smoother, and higher-pitched exhaust note without becoming intrusive.

When combined with our Side Muffler Bypass Pipes, this system creates the ultimate emissions-compliant GT3 exhaust package.

Most importantly, this titanium muffler has been engineered for long-term durability and is designed to eliminate the cracking and structural failures commonly experienced with the factory muffler.

Sound:

The Rennsport Titanium Muffler retains the refined OEM character while delivering a more engaging driving experience. With the PSE valves open, the exhaust becomes noticeably louder, smoother, and sharper in tone thanks to the optimized flow path and signature Fabspeed X-pipe, producing the unmistakable motorsport-inspired sound expected from a GT3.

Performance:

On our Porsche 991.1 GT3 RS development vehicle, paired with our Side Muffler Bypass Pipes, the Rennsport Titanium Muffler produced gains of 27 lb-ft of torque at 3,200 RPM. From 2,900 RPM through 5,700 RPM, the system generated gains of 10 wheel horsepower or more, with peak output increasing from 446 WHP to 454 WHP - an improvement of 8 wheel horsepower (approximately 9 horsepower at the crank).

Features:

• Fits all Porsche GT3 and GT3 RS models from the 997.1 to the 991.2 (2006-2019) worldwide
• Constructed entirely from premium aerospace-grade titanium for exceptional strength, corrosion resistance, and significant weight reduction
• Lightweight titanium construction improves vehicle dynamics while maintaining outstanding durability under extreme temperatures
• Designed from precise 3D scans of the OEM muffler to ensure perfect bolt-on fitment
• Engineered to eliminate the cracking and structural failures commonly associated with the factory muffler
• Incorporates Fabspeed's signature investment-cast X-pipe for superior exhaust scavenging and maximum flow
• Produces gains of +27 lb-ft of torque and +16 WHP (approximately +18 HP at the crank) when paired with Fabspeed Side Muffler Bypass Pipes
• Available with three premium exhaust tip options
• Fully retains factory Porsche Sport Exhaust (PSE) valve functionality
• Guaranteed Check Engine Light-free operation
• Cat-back design remains emissions compliant in all 50 states and international markets
• Precision engineered and manufactured in-house at Fabspeed Motorsport in Fort Washington, Pennsylvania
• Simple direct bolt-on installation with no cutting or welding required
• Backed by the Fabspeed Motorsport Lifetime Warranty

NOTE:

• Requires OEM gaskets and hardware to be reused
• If they are not available here are the necessary part numbers.
• 2x Muffler band straps (99711111970)
• 2x Bolt for muffler band strap (90006736201)
• 2x Each Side Muffler to Center Muffler Gaskets (99711156390, 99711156190)