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Design 911 Design 911 supply Porsche parts, Porsche spares and Porsche accessories, to both retail and to the trade. Our Porsche product and accessory range includes brakes, exhausts, tyres, wheels and Porsche panels and interiors. https://d911api.datadial.net/images/schemaLogo.png https://d911api.datadial.net/images/schemaLogo.png +443456003478 https://d911api.datadial.net Facebook Instagram
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Porsche > 911 & 912 (1965-1989) > 911 1978-1983 3.0L / SC > Exhausts >

Sport Silencers / Mufflers

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Exhaust Muffler / Silencer Bypass. Porsche 911 1974-89 - 91122091102, 93011102200, 93011102203, 93011104300, 93011104301
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Exhaust Muffler / Silencer Bypass. Porsche 911 1974-89
FSPOR911MB
Product Information
Product Information
Fabspeed Muffler Bypass Pipe with Adjustable Turndown

Reduce weight, increase power, and improve sound with bypass pipes for both the primary and secondary mufflers; includes adjustable turndown tip for exhaust volume control.

FEATURES:
• Fits: Porsche 911 3.0L / Carrera 3.2L 1974-83 all models
• Very aggressive CUP car sound. Recommended for Track Use ONLY!
• Adds 14whp and significant throttle response
• Constructed from 14-16 gauge, T304 C.N.C. Mandrel bent stainless steel
• Saves 25 lbs from the vehicle
• Direct replacement for OEM muffler works with stock cats and fabspeed's catbypass pipes
• Easy on and easy off installation, perfect for weekend Track Events
• System comes with outlet pipe, clamp and slip-on turndown
• All Fabspeed performance products are backed by the Fabspeed Lifetime Limited Warranty

Please note: This is a special-order item manufactured to order. In some cases, please allow 4 – 5 weeks for the delivery. Special order items cannot be cancelled from this supplier once your order has been placed.

Related reference numbers
Related, superseded, cross reference or alternative numbers for comparison.

FSPOR911MB
91122091102
93011102200
93011102203
93011104300
93011104301

The product you are viewing cross references to these numbers
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About Sport Silencers / Mufflers

Porsche Sport Silencers & Mufflers - Performance Sound & Exhaust Upgrades

Sport Silencers / Mufflers are designed to enhance the sound, performance, and driving character of your Porsche by improving exhaust gas flow and delivering a more engaging exhaust note. Compared to standard exhaust silencers, sports mufflers reduce restriction, sharpen throttle response, and provide a sportier tone that better reflects Porsche’s performance heritage.

Available from Design911, this category includes both genuine Porsche sport exhaust components and high-quality aftermarket performance mufflers, giving owners the choice between factory-engineered authenticity and performance-focused customisation.

What Do Sport Silencers / Mufflers Do?

Sport silencers optimise exhaust flow while enhancing sound quality.

Core Functions:

  • Reduce exhaust backpressure for improved engine breathing.
  • Enhance throttle response and power delivery.
  • Produce a deeper, sportier exhaust note.
  • Improve exhaust efficiency and flow dynamics.
  • Enhance the overall driving experience.

A well-designed sports muffler balances performance gains with refined sound control.

Why Do Standard Exhaust Silencers Fail or Fall Short?

Standard exhaust mufflers are designed primarily for noise reduction, emissions compliance, and longevity. Over time, common issues include:

  • Internal corrosion from condensation and heat cycles.
  • Restrictive baffling limiting exhaust flow.
  • Dull or muted exhaust sound.
  • Internal baffle breakdown causing rattles.
  • Reduced efficiency when paired with performance upgrades.

As these components age, both performance and sound quality can deteriorate.

Why Upgrade to Sport Silencers / Mufflers?

Sport silencers are engineered to improve both performance and auditory feedback.

Upgrade Benefits:

  • Improved exhaust flow and reduced restriction.
  • Enhanced exhaust sound without excessive drone.
  • Increased driving engagement and responsiveness.
  • Available in OEM Porsche or performance aftermarket options.
  • Ideal for road, touring, and spirited driving.

Upgrading delivers a more exciting exhaust character while supporting engine efficiency.

Highlights

  • Porsche sport silencer and muffler upgrades
  • OEM Porsche and premium aftermarket options
  • Improved exhaust sound, flow, and performance
  • Designed for performance-focused driving
  • High-quality materials for durability and reliability       

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