FABSPEED SECONDARY MUFFLER BYPASS FOR 964 PORSCHE 911 CARRERA
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Fabspeed Secondary Muffler Bypass for 964 Porsche 911 Carrera
Fabspeed’s Secondary Muffler Bypass for 964 Porsche 911 Carrera answers the question every 964 owner eventually asks: how much better does this car feel with the dead weight taken out of it? Porsche Motorsport developed this pipe for the Carrera Cup cars that raced from 1990 to 1993, and Fabspeed replicates it in Fort Washington, Pennsylvania, on the same straight-through principle. Twenty-five pounds leave the right rear corner, a restriction leaves the exhaust path, and the flat-six gains the harder, more urgent voice the Cup cars were known for. For an air-cooled 911 kept for the way it drives, few changes of this size do this much.
Bolt-On and Go
- The Secondary Muffler Bypass for 964 Porsche 911 Carrera goes in with hand tools, reusing the factory 964 donuts and clamps, with no cutting and no welding, and it comes back out just as easily if the car is ever returned to stock. The pipe exits in the factory position, so owners can keep the original right-side tip or fit the Fabspeed Deluxe Oval Style Right-Side Tip (FS.POR.964.SROTP) in the same afternoon.
Features
- Straight-through replacement for the factory 964 secondary muffler, 25 pounds (11.4 kg) lighter than the OEM unit
- Weight comes off the right rear corner, where it does the most damage to turn-in and traction
- Replica of the Porsche Motorsport pipe fitted to the 964 Carrera Cup cars
- CNC mandrel-bent 3.0 inch (76mm) T304L stainless steel tubing, 14-16 gauge, TIG welded
- Frees throttle response and power by taking a restriction out of the rear of the system
- 100% EPA and CARB compliant
- Reuses the factory 964 donuts and clamps, Level-1 install difficulty
- Backed by the Fabspeed lifetime warranty
Applications
- Porsche 911 Carrera 2: 964 | 1990-1994 | 3.6L F6
- Porsche 911 Carrera 4: 964 | 1989-1994 | 3.6L F6
- Porsche 911 Carrera Cup: 964 | 1990-1993 | 3.6L F6
- Porsche 911 Carrera RS: 964 | 1992-1993 | 3.6L F6
- Porsche 911 RS America: 964 | 1993-1994 | 3.6L F6
- Porsche 911 Speedster: 964 | 1993-1994 | 3.6L F6
Notes
- Fits 964 engines of 3.6 and 3.8 liters running the factory 964-style rear exhaust
- Direct replacement for the OEM 964 secondary muffler and the 965 C2 Turbo secondary muffler
- The Fabspeed Sound Solutions warranty does not apply to this part
- Keep the factory right-side tip or pair the pipe with the Fabspeed Deluxe Oval Style Right-Side Tip (FS.POR.964.SROTP)
- To do the center muffler at the same time, add the Fabspeed Primary Muffler Bypass for 964 Porsche 911 Carrera (FS.POR.964.PMB)
- All Fabspeed products are expected to ship within one week of order, and timelines are often much quicker
Frequently Asked Questions
- Will the Fabspeed Secondary Muffler Bypass for 964 fit my Porsche 911 Carrera? Yes. The Secondary Muffler Bypass for 964 fits every 964 Carrera built from 1989 to 1994, including the Carrera 2, Carrera 4, RS America, Speedster, Carrera RS and Carrera Cup, with 3.6 or 3.8 liter engines running the factory 964-style rear exhaust. It is a direct replacement for the OEM 964 secondary muffler, so nothing is cut or modified to fit it.
- How much weight does the Fabspeed pipe save, and where does it come off? Twenty-five pounds, or 11.4 kg, come off the right rear corner of the car, directly behind the right rear wheel. That is the worst place on a 911 to carry mass, so the change shows up in turn-in, in how quickly the rear settles, and in acceleration. The straight-through pipe weighs a fraction of the factory muffler it replaces.
- How much louder is the car with this pipe fitted? Noticeably fuller and harder edged, though Fabspeed does not publish a decibel figure for this part. The car keeps the rest of its factory 964 exhaust, so the result is a stronger flat-six voice under throttle rather than a full race exhaust. Owners who want more can add the primary muffler bypass alongside it.
- Is the Fabspeed secondary muffler bypass street legal? Yes. Fabspeed states the pipe is 100% EPA and CARB compliant. It replaces a muffler, not emissions hardware, so the car’s emissions equipment is untouched. Local noise ordinances still apply and vary by state and municipality, so check the rules where the car is driven and inspected before fitting it.
- How difficult is the installation? Level-1. The pipe reuses the factory 964 donuts and clamps and needs no cutting or welding, so it bolts in with hand tools on a lift or on stands. Budget the time you would give any exhaust clamp job, and plan to replace any factory donut that is crushed, hardened or leaking while the system is apart.
- What is the difference between the primary and secondary muffler bypass for the 964? They replace different parts of the same system. The primary muffler bypass replaces the center muffler, and the secondary muffler bypass replaces the right-side rear muffler that carries most of the weight. Each is sold separately and either can be fitted on its own; running both gives the largest weight saving and the loudest result.
About Fabspeed
Fabspeed Motorsport builds its exhaust hardware in Fort Washington, Pennsylvania, out of a 26,000 square foot facility that doubles as a gathering point for the Porsche Club of America, Ferrari, McLaren and Lamborghini clubs. Every product is designed, engineered, dyno tested, street driven and raced in-house rather than farmed out, and the company works directly with race engine builders and tuners in Italy, Germany and the United States. Systems are fabricated from aerospace-grade austenitic stainless steel, titanium and carbon fiber, and every Fabspeed performance part carries the company’s lifetime warranty.
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- Please review the product dimensions carefully to ensure the right fit for your space
- Color may vary slightly due to lighting and screen settings
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- Some items may require simple assembly upon delivery
- Perfect for both everyday use and long-term comfort
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Product Size Guide
Please refer to the general size reference below to better understand how this product may fit into your space. Dimensions may vary slightly depending on the design and materials.
| Category | Small | Medium | Large |
|---|---|---|---|
| Decor & Accessories | Up to 10″ | 10″ – 20″ | 20″+ |
| Tables | Up to 30″ | 30″ – 60″ | 60″+ |
| Seating | 1 Seater | 2–3 Seater | 4+ Seater |
| Storage Units | Compact | Standard | Large Capacity |
| Lighting | Small Fixture | Standard Fixture | Large Fixture |
Note: For exact product dimensions, please refer to the specifications section above. This guide is intended as a general reference only.
FABSPEED SECONDARY MUFFLER BYPASS FOR 964 PORSCHE 911 CARRERA
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