SOUL Performance Side-Muffler Bypass Pipes for 991 Porsche 911 GT3 / GT3 RS

SOUL Performance Products’ Side Muffler Bypass Pipes for the Porsche 991 GT3 / GT3 RS / 911R replace the bulky factory side mufflers with lightweight, free-flowing 3″ T304L stainless tubing to shed roughly 38lb from the rear of the car while significantly reducing heat soak in the engine bay and around the rear tires. Large 3″ mandrel-bent primaries and an enlarged opening into the secondary pipe improve flow and help equalize pressure in the center muffler, promoting longevity under repeated hard use. The result is a louder, more exotic, race-derived exhaust note with noticeable cabin presence in the 2,000-3,000rpm range and an even more intoxicating wail above 5,000 rpm, turning every wide-open throttle pull into an event. Each set is built in-house at SOUL’s Willow Grove, PA facility from 3″ .065″-wall T304L stainless with high-quality flex bellows for durability, then fixture-tested for precise, direct bolt-on fitment with no cutting or permanent modification required. Backed by SOUL’s renowned Lifetime Warranty for both street and track use, these side muffler bypass pipes are an ideal solution for 991.1 / 991.2 GT3, GT3 RS, and 911R owners who want major weight savings, cooler temps, and an always-exciting exhaust note.

Development & Testing

• By removing the side mufflers, significant weight savings are achieved, aiding in improved heat management within the engine bay and promoting cooler temperatures for the rear tires. The hole leading to the secondary pipe is enlarged to equalize pressure in the center muffler, thereby reducing the likelihood of it cracking. Additionally, the inclusion of flex bellows allows for effortless installation while preventing cracking under extreme racing conditions.
• The flow is enhanced by incorporating primary piping with a generous diameter of 3 inches.

Construction

• Maximum durability is achieved in every set by utilizing T304L stainless steel tubing, mandrel bent with a diameter of 3 inches and a wall thickness of 0.065 inches. Furthermore, high-quality flex bellows are employed to ensure longevity and reliability.

Sound

• Anticipate a noticeable increase in volume without any undesirable tonal aspects. Instead, you’ll be delighted with a more exotic and race-inspired auditory experience. Enhanced cabin presence will be discernible within the 2000-3000rpm range, while the exhaust note will become even more remarkable beyond 5000rpm.

Bolt On & Go

• Every exhaust undergoes thorough testing within a fixture to guarantee impeccable fitment. Subsequently, it is carefully foam packed to ensure its flawless condition upon arrival, ready for installation without the need for any cutting or modification.

Features

• Lightweight T304L stainless side bypass pipes
• 38lb rear-end weight reduction and improved heat management
• Louder, more exotic, race-inspired exhaust note
• Mandrel-bent primaries with enlarged secondary opening for smoother flow
• Direct bolt-on fitment with flex bellows, backed by SOUL’s Lifetime Warranty

Applications

• Porsche 911 GT3: 991.1, 991.2 (2013-2019)
  [3.8L F6] [4.0L F6]
  
• Porsche 911 GT3 RS: 991.1, 991.2 (2015-2019)
  [4.0L F6]
  
• Porsche 911 R: 991.1 (2016)
  [4.0L F6]
  

Notes

• Please note that this particular product does not possess CARB certification and may not comply with regulations for use on emissions controlled vehicles. It is designed exclusively for off-road purposes.

About SOUL Performance

SOUL Performance Products was founded by a group of automotive enthusiasts with deep industry experience and a commitment to doing right by their customers. Their mission is to deliver outstanding performance parts at fair pricing, backed by quality service and one of the best warranties in the industry. SOUL develops high-performance exhaust systems and components that are engineered for exceptional sound and proven performance, with products ready to ship quickly worldwide. Guided by core values of honesty, transparency, and passion for cars, they build strong community connections and prioritize customer satisfaction at every step. Operating out of a dedicated facility in Willow Grove, Pennsylvania, SOUL combines hands-on research, engineering, and manufacturing expertise to create parts that meet and exceed the demands of serious enthusiasts.