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Fabspeed Competition Long Tube Header System Porsche 991 GT3 / GT3 RS (2014-2019)

SKU: FS.POR.9912GT3.LTRHS
Price
$6,856.95
Currently Backordered - You can still place your order and we'll ship your order as soon as the product is back in stock!

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Installation Services

Don’t worry about the hassle — let our expert team at Forza Motorworks handle the installation for you. Our professional installation ensures everything fits and operates exactly as intended, giving you clean, factory-quality results, proper wiring or mounting, and avoiding the risks of DIY mistakes. You’ll save time, avoid frustration, and get peace of mind knowing the job is done right the first time. Contact us to learn about our installation services and enjoy a seamless upgrade from day one.

FAQ

Shipping Information
For items that are in stock, purchases made after 9am EST will be usually be shipped out in the next 1-2 business days. Please inquire to confirm lead times if you have specific time constraints. Orders will be sent via signature required at our discretion unless otherwise requested.

International Shipping
Any and all customs duties, taxes, import fees, and/or tariffs assessed in connection with the purchase shall be the sole responsibility of the customer/end user.

Return Policy
We have a 30-day return policy, which means you have 30 days after receiving your item to request a return. To be eligible for a return, your item must be in the same condition that you received it, unused and in its original packaging. All returns are subject to a restocking fee based on item and package condition. Buyer is responsible for paying for return shipping costs. If you need a return label, we will email you a return label and deduct cost from refund. Original shipping costs are not refundable. Special order items are not eligible for return.

Cancellation Policy
In order to cancel your order you must email within 24 hours of placing your order or before your order has shipped, whichever occurs first. Special order items are not eligible for cancelation.

Exchange Policy
We have a 30-day exchange policy, which means you have 30 days after receiving your item to request an exchange. To be eligible for an exchange, your item must be brand new in box. Buyer is responsible for paying all shipping costs to exchange product.

Product 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.