Fabspeed Long-Tube Exhaust Header System for Porsche 991 GT3 & GT3 RS (2014–2019)

Description

Unlock next-level performance for your Porsche 991 GT3 or GT3 RS with this full long-tube competition header system by Fabspeed. Purpose-built for track and high-performance road use, the kit replaces factory manifolds and side muffler assemblies with high-flow 321-grade stainless tubing and high-velocity merge collectors to deliver dramatic gains in throttle response, horsepower and torque throughout the rev range.

Fitment Notes

• Fits Porsche 991 GT3 (2014–2019) and GT3 RS (2016–2019) models.

• Intended for track/competition use; not street legal in many regions. 

• Retains bolt-on installation using factory mounting points; designed to replace OEM headers & side muffler bypass pipes.

• May require ECU tuning or adjustments for optimal performance depending on supporting mods.

Included

• Left and right bank long-tube header assemblies

• Integral side-muffler bypass pipe section (for each side)

• Mounting hardware, gaskets and instruction sheet

Product Specs

• Construction: Mandrel-bent 321 stainless steel primary tubes with billet/CNC merge collectors developed in collaboration with Burns Stainless LLC. 

• Dyno gains: With ECU tune, up to +38 whp and +26 ft-lb of torque at ~7,650 rpm. Without tune, gains of +24 whp / +16 ft-lb at ~7,650 rpm and +23 whp / +26 ft-lb at ~4,500 rpm. 

• Weight reduction: Approx. 40 lb (≈18.1 kg) removed from the rear of the vehicle for improved agility and responsiveness. 

• Designed for competition use; may be not compatible with emissions-legal requirements in certain jurisdictions.

Product Features

• Maximum Flow Design: Long-tube architecture with optimized runner lengths and high-velocity merge collectors deliver improved scavenging and broader torque curve.

• Weight Reduction: By removing stock headers and muffler assemblies, the system drops considerable weight off the rear for better handling dynamics.

• Aggressive Sound: Opens up the flat-six’s exhaust voice with no compromise—track-focused tone and increased presence.

• Premium Build Quality: Crafted with aerospace-grade materials and workmanship in partnership with world-class motorsport header manufacturer.

• Track-Ready Engineering: Designed for high rpm, repeated heat cycles, and rigorous driving conditions—built for real performance.

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