Fabspeed Rennsport Muffler for 997.2 Porsche 911 GT3 & GT3 RS



Fabspeed Rennsport Muffler

Guaranteed Safe Checkout
Payment Options - American Express, Discover, Visa, MasterCard, JCB, Maestro Credit Cards Payment Options - Apple Pay, PayPal, Splitit, Dinser Club International, Union Pay Credit Cards
SKU: FS.POR.9972GT3.RSMXX Category: Vehicle: Brand:
Additional Info
Shipping policy

Fabspeed Rennsport Muffler for 997.2 Porsche 911 GT3 & GT3 RS

Many GT3 owners are aware that the OEM mufflers are susceptible to cracking, breaking, and blowing out, especially the titanium mufflers found on GT3RS cars. Fabspeed aimed to develop a muffler replacement that not only addressed this issue but also enhanced the OEM design. Drawing upon their 25+ years of experience with air and water-cooled systems, they enlarged the valve to 2.75 inches (70mm), which is the optimal diameter for GT3 engines to reduce restriction while maintaining high velocity and the distinctive high-pitched sound characteristic of GT3 CUP cars. They also incorporated their signature investment cast x-pipe for optimal exhaust scavenging, effectively merging the two cylinder banks without impeding exhaust flow. To preserve the factory muffler’s exhaust note and prevent drone, they replicated Porsche’s 7-chamber design, resulting in a muffler that is completely free from drone, even when equipped with race headers.


  • The muffler will produce a tone closely resembling that of the OEM muffler, albeit slightly louder when the PSE is activated. Additionally, it will offer a smoother and more elevated pitch, courtesy of Fabspeed’s distinctive x-pipe design. When combined with Fabspeed’s side muffler bypass pipes, the vehicle’s complete sound profile is unleashed.


  • On their 991.1 GT3RS test car, when combined with side muffler bypass pipes, the rennsport muffler demonstrated a notable increase of 27 ft/lbs of torque at 3,200 rpm. Between 2,900 rpm and 5,700 rpm, it consistently gains 10whp or more, with peak whp rising from 446 to 454. This translates to a gain of 8whp or 9hp at the crank.


  • Constructed from CNC cut T304L stainless steel
  • Designed from 3D scans of the OEM muffler to achieve perfect bolt-on fitment
  • Will not break or crack compared to factory equipment
  • Incorporates signature cast x-pipe for superior flow and exhaust scavenging
  • Paired with our side muffler bypass pipes this muffler adds 27 ft/lbs and +16whp
  • Completely retains PSE valved exhaust functionality
  • No Check Engine Light guaranteed
  • 3 different tip options available
  • Built in house at Fabspeed Motorsport USA in Fort Washington, PA
  • Simple bolt-on installation, no cutting or welding required
  • All Fabspeed performance products are backed by the Fabspeed lifetime warranty


  • 2010-2012 Porsche 911 GT3: 997.2  |  3.8L F6
  • 2010-2012 Porsche 911 GT3 RS: 997.2  |  3.8L F6


  • All Fabspeed products are expected to ship within one week of order, though timelines are often much quicker
  • Installing Rennsport muffler requires OEM gaskets and hardware to be reused
  • This cat-back system is emissions legal in all 50 states and the rest of the world

About Fabspeed

Fabspeed Motorsport is situated in Fort Washington, Pennsylvania, within the United States of America. Their extensive 26,000 sqft. facility serves as a hub for various car clubs, including Porsche Club of America, Ferrari, McLaren, Lamborghini, and more. The company is renowned for its comprehensive approach to product development. They handle the entire process, from design and engineering to dyno testing, street trials, and racing assessments, ensuring the quality and performance of every item. Fabspeed also collaborates closely with race engine builders and tuners hailing from Italy, Germany, and the United States, resulting in the creation of the Ultimate Performance parts. To cater to their passionate global audience, Fabspeed meticulously crafts systems using aerospace-grade austenitic stainless steel, titanium, and carbon fiber materials, setting a standard for excellence in the industry.

The Bulletproof Automotive website contains many thousands of products purchased in multiple different currencies. All of the prices are entered manually and accurately at the time of entry. Due to the consistently fluctuating international exchange rates, at times prices may not be able to be honored at their original intended rate. We apologize for any inconvenience this may cause, unfortunately our website is unable to compensate dynamically for what can at times be volatile changes in the cost of items due to currency values fluctuating, changes in prices from suppliers, changes in shipping and import duties, and other factors. Rest assured that any order you place on line will be at zero risk to you in this area. If in the event your order cannot be fulfilled at the original intended website price we will offer you a 100% refund, no questions asked. We will continue to do our best to maintain updated prices and we will always continue to offer our price match guarantees as well to ensure our prices are always the best for you. In short, prices may change without notice. It is always advised to give us a call prior to placing your order online to confirm availability and to confirm current pricing.
Items that are in stock in the US, either at Bulletproof’s warehouse or at a supplier’s warehouse, are generally delivered within 7-10 days. Special order items from overseas take considerably longer. As a courtesy Bulletproof offers delivery estimates to our customers which take into consideration manufacturer availability and shipping schedule. These estimates represent our best guess based on previous orders from the manufacturer and do not in any way imply a guaranteed delivery window. Many manufacturers work in a “just in time” inventory system and often take 2-20+ weeks to produce an item once an order is submitted. All deliverable items are then sent to our Japanese warehouse. Bulletproof ships a minimum of one full ocean freight container every month from Japan, oftentimes more than one a month. Ocean freight takes an average of 4 weeks. Typically it breaks down to one week in Japan for paperwork and customs, two weeks by boat and one week in US customs/clearance. Due to the wide number of variables between manufacturer and shipping schedules, delivery estimates are simply just that – estimates. We attempt to estimate conservatively and we usually deliver faster than our estimates suggest. It is not Bulletproof’s policy to guarantee delivery time of any special order item, this is impossible for us to do. By ordering you acknowledge that there is no required delivery ETA and an order may not be canceled or altered due to manufacturing or shipping delays, all ETA’s are provided as a best guess only. Please review the full Terms & Conditions here.
We do pricing a little differently on our JDM brands and we believe in making things simple and clear. No hidden fees or surcharges. Every price you see includes the shipping cost to our office in Los Angeles, California and all the associated taxes/duties/fees for bringing the products into the US. The only shipping you ever pay is from our facility in the US to your location. Be wary of resellers that don’t include the cost of international shipping in their pricing on JDM parts. While we believe we’ll always have the lowest all-in price on JDM products, we offer a price match guarantee for all authentic parts purchased from authorized dealers as well. For many international customers, it’s much more affordable to ship from the USA than from Japan directly, as the air freight and ocean freight costs are typically much less. However, for customers looking to ship directly from Japan outside of North America, or domestically in Japan, we can provide pricing specifically for that scenario. Please do not hesitate to contact us with any pricing questions or concerns. Please email us at sales@bulletproofautomotive.com with any inquiries.


There are no reviews yet.

Only logged in customers who have purchased this product may leave a review.

Stay up to date with the latest product releases, Bulletproof Automotive builds and more. Sign up for our newsletter to receive the most up to date information in the aftermarket tuning world, and bring your build to a whole new level.