Fabspeed Primary Muffler Bypass for Porsche 964 Carrera (1989–1994)

The Fabspeed CUP-style pipe replaces the large primary muffler behind the license-plate area on a Porsche 964 Carrera. It leaves the separate catalyst and secondary side muffler in the exhaust path, making it a different change from a catalyst bypass or complete Maxflo system. Based in Fort Washington, Pennsylvania, Fabspeed Motorsport designs exhaust systems, air intakes and ECU tuning for Porsche and other sports cars. Dynamometer testing, road evaluation and racetrack development inform its product range.

Technical Details

• Manufacturer part number: FS.POR.964.PMB.
• 14–16-gauge T304L stainless construction with mandrel bends.
• Manufacturer-reported weight reduction: 25 lb.
• Fabspeed identifies approximately 10 wheel horsepower in its testing, separately from the larger crank-horsepower claim.
• Reuse the two original ball clamps and sealing donuts; other required hardware is supplied.
• Covered by the Fabspeed Lifetime Warranty, subject to its terms and exclusions.

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Fitment & Compatibility

For 1989–1994 Porsche 964 C2, C4, RS America, Euro RS and Speedster. Check the original primary/secondary muffler layout and the condition of the reused connections. Final volume depends on the remaining catalyst and side silencer.

PMB Performance brings over 20 years of Porsche parts experience to your order. Send us your VIN and details of the installed system if you need help matching this component.