Does SOUL Performance make valved side-muffler bypass pipes for the 991?

Yes. The SOUL Performance 991 Valved Side-Muffler Bypass Pipes is built by SOUL Performance for the 991 Porsche 911 GT3 / GT3 RS / R.

Which models does this fit?

The Valved Side-Muffler Bypass Pipes is engineered for the 991 Porsche 911 GT3 / GT3 RS / R. Fitment is specific to the chassis and model years listed in the Applications section above.

How does it change the sound?

SOUL engineers the Valved Side-Muffler Bypass Pipes to sharpen tone and character while controlling unwanted resonance. The final sound depends on the rest of your setup.

Is an ECU tune required?

A tune is not required to fit the Valved Side-Muffler Bypass Pipes. Many owners add a tune to maximize the gains.

How is it constructed?

SOUL builds the Valved Side-Muffler Bypass Pipes from durable mandrel-bent stainless steel with precise, fixture-tested fitment.

Is professional installation recommended?

Yes. We recommend installing the Valved Side-Muffler Bypass Pipes through a qualified technician to ensure correct fitment and a proper seal.

Description

Additional Info

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BP PRICING DIFFERENCE

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Description

Soul Performance Valved Side-Muffler Bypass Pipes for 991 Porsche 911 GT3 / GT3 RS / R

SOUL Performance Products’ Valved 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 valved sections, shedding over 35 lb from the rear of the car while dramatically improving heat management around the engine bay and rear tires. Large 3″ mandrel-bent primaries and an enlarged opening into the secondary pipe increase flow and help equalize pressure in the factory center muffler, promoting its longevity under repeated hard use. High-quality valves and flex bellows are engineered to operate like OEM, giving you a smoother, more refined transition between quiet and loud than a center muffler bypass, moderately louder and more present with the valves closed, and a truly exotic, motorsport-inspired GT3 pitch when open. Each set is fabricated from 3″.065″-wall T304L stainless with high-grade flex bellows for durability, then fixture-tested to ensure direct bolt-on fitment with no cutting or permanent modification required. Backed by SOUL Performance Products’ renowned Lifetime Warranty on both the valves and the piping, these Valved 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 a more exciting, controllable exhaust note that still works perfectly for daily use and track days alike.

Development & Testing

By removing the side mufflers, significant weight savings are achieved, aiding in heat management within the engine bay and contributing to cooler rear tires. To ensure longevity, the hole leading into the secondary pipe is enlarged, equalizing pressure in the center muffler. Flex bellows are incorporated to facilitate straightforward installation and enhance durability, especially in demanding racing conditions, resembling the OEM standards. The implementation of large 3″ diameter primary piping promotes increased flow, while the high-quality valves operate like the factory specifications.

Construction

Every set is meticulously crafted from mandrel-bent T304L stainless steel tubing with a 3″ diameter and.065″ wall thickness. Additionally, high-quality flex bellows are incorporated into each set to ensure exceptional durability and longevity.

Sound

The sound transition between open and closed states is exceptionally smooth compared to a center muffler bypass setup. When the valves are closed, the tone experiences a moderate increase while maintaining a comfortable sound level when the factory center muffler is installed. On the other hand, when the valves are open, a refined and exotic pitch is revealed, perfectly complementing the high-performance nature of the GT3 engine.

Bolt On & Go

To ensure flawless fitment, every exhaust undergoes rigorous testing in a fixture. Furthermore, each exhaust is meticulously foam packed for secure and protected shipping, arriving in perfect condition. The exhaust is designed for a straightforward installation, with no cutting or modifications required. It is ready to be installed seamlessly right out of the box.

Features

Lightweight 3″ T304L stainless valved side bypass pipes
Over 35lb rear-end weight reduction and improved heat management
OEM-style valves and flex bellows for smooth, reliable operation
Noticeably louder, more exotic GT3 tone with valves open, mild with valves closed
Direct bolt-on fitment with no cutting, backed by SOUL’s Lifetime Warranty

Applications

Porsche 911 GT3: 991.1, 991.2 | 2013-2019 | 3.8L 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 the legal requirements for use on emissions controlled vehicles. It is specifically intended for race use only.
For compatibility with aftermarket headers that relocate the O2 bungs to the side-muffler bypass, optional O2 bungs can be added. However, as a default for the sake of weight reduction, Soul Performance Products does not include them. If you require this option, please get in touch with The Bulletproof Team for further assistance.

Frequently Asked Questions

Does SOUL Performance make valved side-muffler bypass pipes for the 991? Yes. The SOUL Performance 991 Valved Side-Muffler Bypass Pipes is built by SOUL Performance for the 991 Porsche 911 GT3 / GT3 RS / R.
Which models does this fit? The Valved Side-Muffler Bypass Pipes is engineered for the 991 Porsche 911 GT3 / GT3 RS / R. Fitment is specific to the chassis and model years listed in the Applications section above.
How does it change the sound? SOUL engineers the Valved Side-Muffler Bypass Pipes to sharpen tone and character while controlling unwanted resonance. The final sound depends on the rest of your setup.
Is an ECU tune required? A tune is not required to fit the Valved Side-Muffler Bypass Pipes. Many owners add a tune to maximize the gains.
How is it constructed? SOUL builds the Valved Side-Muffler Bypass Pipes from durable mandrel-bent stainless steel with precise, fixture-tested fitment.
Is professional installation recommended? Yes. We recommend installing the Valved Side-Muffler Bypass Pipes through a qualified technician to ensure correct fitment and a proper seal.

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.

Additional Information

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.

Shipping Policy

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.

BP Pricing Difference

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.

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