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Fabspeed Porsche 991.2 GT3 / GT3 RS Side Muffler Bypass Pipes (2017-2019)

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$1,245.95 - $1,895.95
Calculated at Checkout
HP (whp):
TQ (ft/lbs):
WT (lbs) KG.s:
41 / 18.63

Fabspeed Porsche 991.2 GT3 / GT3 RS Side Muffler Bypass Pipes (2017-2019)

$1,245.95 - $1,895.95

Fabspeed Porsche 991.2 GT3 / GT3 RS Side Muffler Bypass Pipes (2017-2019)

$1,245.95 - $1,895.95

Optimized design that replaces the heavy and restrictive factory GT3 side mufflers for improved exhaust flow, increased dynamic sports car sound and huge significant weight savings.                                                                                           

Utilizing super premium Helical U.K. Great Britain Imported Aerospace grade valves along with the addition of O2 bungs, Fabspeed's Side Muffler Bypass Pipes provide the ultimate street and track solution for the 991.2 GT3 / GT3 RS. Prefect upgrade for any Street Driven GT3 touring, GT3RS, GT3 PDK cars. Factory Sport Button PSE is 100% retained with Fabspeed GT3 side muffler bypass pipes with exhaust valves.


  • Fits all Porsche 991.2 GT3 / GT3 RS / 911R vehicles worldwide 2017-2019
  • Highest quality OEM Porsche Ag. Helical Limited United Kingdom exhaust valves are used for bullet-proof reliability. 
  • NO cheap 100% guaranteed to fail, break, vibrate and melt Chinese exhaust valves like competitors cheap systems
  • Helical aerospace valves cost $375 each 2 required versus cheap $35 Asian valves. Caveat Emptor. 
  • Includes O2 bungs and plugs at no extra charge.
  • Saves  a massive 41+ lbs 18.6 kg from the rear of the vehicle
  • CAT-BACK Emissions legal. Bolts onto OEM Porsche catalytic converters
  • Replicates aggressive CUP car sound for the street. Not too loud 
  • Increased power +9HP versus stock OEM heavy restrictive dual side mufflers.
  • 14-16ga T304 Stainless Steel construction
  • Retains Sport Button PSE functionality. PSE = Porsche sport exhaust 
  • Simple bolt-on installation- remove rear left and Right side mufflers and install these Works of Art. . 
  • All Fabspeed performance products are backed by the Fabspeed Lifetime Warranty


We chose to use Helical Valves on our 991.2 GT3 / GT3 RS track exhaust systems for their unprecedented quality - PORSCHE MOTORSPORTS AG actuallu uses HELICAL valves on their GT3 side mufflers and ONLY FABSPEED uses the exact same Helical valve. Same part# same bullet proof quality. which have been proven by many OEM manufacturers such as McLaren, Ferrari, Lamborghini, Pagani,  and many more. Helical valves are an integral part of our Side Muffler Bypass pipes, opening and closing with precision to control the gas flow and optimizing engine back-pressure for improved performance. Helical's extensive experience in high-volume OEM automotive applications has led to standard features such as an extremely durable pneumatic actuator, precision flat sealing faces inside the valve, stiffening ribs and Ultra high temperature high-temperature bearings at both ends of the butterfly spindle. Helical is an Aerospace Company that also makes exhaust components. Fabspeed Motorsport USA is the USAs exclusive importer buyer. 


We relocated the O2 bungs from the collector of the headers to the Side Muffler Bypass Pipes in order to maintain factory-like functionality with our Long Tube Competition Race Headers - allowing them to read all cylinders while maximizing the performance of the collector. This design will replace our existing SMBP's allowing you to upgrade to our Long Tube Race Header design at any time in the future.  Extra oxygen sensor ports also allow Data Acquisition at any time. Another value added feature only from Fabspeed. 

Click Here For Install Instructions for Porsche Homelink Connection For Valvetronic Exhaust Control

Note: only Fabspeed Motorsport USA uses Helical Limited England exhaust valves on all systems. Porsche uses Helical exhaust valves on their GT3 mufflers because the valves are bullet-proof silica carbide. FYI- Ferrari, Lamborghini, McLaren, Aston Martin all demand and use Helical Exhaust Valves UK. for their sports cars and hypercars because only Helical doesn't melt, crack, break, flutter or rattle. 


Returns Policy

To RETURN any system, product or merchandise you must contact us first for a Return Authorization (RA) Number. Special order and custom made systems, apparel, Carbon Fiber Wall Art, and other certain merchandise are NOT returnable. ALL SALES ARE FINAL. To return a Fabspeed Motorsport product an RA number must be requested and if granted the item(S) must be in original Fabspeed Motorsport sealed packaging. A copy of the original invoice and a brief explanation must accompany all returned items. You must follow our instructions for returning items carefully, or Fabspeed Motorsport reserves the right to charge a 25% restocking fee on any OPENED box or repackaged products. Customers are responsible for return shipping charges. If an order was shipped with a promotional “Free Shipping”, and the order is returned, we exclusively reserve the right to charge the customer or distributor for the cost of that original shipping and handling. If a Fabspeed Motorsport Performance package is ordered, and an individual component of that package is returned, Fabspeed Motorsport reserves the right to charge back the performance package discount along with any additionally offered discounts. Return shipped items DAMAGED in transit will RESULT in additional charges up to and including rejection of the competent. It is the customer’s responsibility to ship safely and properly. No returns accepted after 30 days from the invoice date. No credits will be given after 30 days from the invoice date.

To qualify for return, the product must be unused and remain in the original packaging, as well as match the current design and packaging for the product at the time of return. Sounds is subjective and therefore does not qualify for a return of a used product. See Sound Solution Guarantee to see if your product is covered.

Periodically mistakes are made when ordering, or a wrong part is shipped, and you may wish to return an item. We will do everything reasonable to satisfy you. Please contact Fabspeed Motorsport immediately via email at to discuss the circumstances before returning any products. Anything returned without prior authorization from Fabspeed Motorsport will be refused. All returns must be sent back fully prepaid. Our customer service department ( will issue a Return Authorization Number, which must accompany any return. A copy of the original invoice and a brief explanation must accompany all returned items. No returns accepted after 30 days from the invoice date. No credits given after 30 days.


Fabspeed Motorsport cannot be held liable for refusal of, delay of, loss of, theft or damage to a shipment of any item. The customer agrees to indemnify Fabspeed Motorsport for all costs, fees and expenses Fabspeed Motorsport incurs as a result of any violation of any local, state, federal, national or international laws or regulations. Customer agrees to take responsibility for lost packages that were not independently insured or sent without requiring signature. The customer understands they will be liable in the event of additional fees, tariffs, or legal issues such as border seizure. Customer accepts these risks and agrees to release Fabspeed Motorsport of all liability.

Fabspeed Motorsport reserves the right to charge a shipping and handling fee on every order being shipped from our facility. This fee is universal and applies to all retail and wholesale purchases and cannot be waived or credited.

A 6% sales tax will be implemented for every purchase made by a Pennsylvania resident. This fee will be charged for in-house installations and products purchased online, over the phone, and/or via email, this fee is required by law, is non-negotiable and non-refundable.