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Fabspeed Muffler Bypass w/Adjustable Turn Down Porsche 911 Carrera (1976-1989)

SKU: FS.POR.911.MB
Price
$359.95
Currently Backordered - You can still place your order and we'll ship your order as soon as the product is back in stock!

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Installation Services

Don’t worry about the hassle — let our expert team at Forza Motorworks handle the installation for you. Our professional installation ensures everything fits and operates exactly as intended, giving you clean, factory-quality results, proper wiring or mounting, and avoiding the risks of DIY mistakes. You’ll save time, avoid frustration, and get peace of mind knowing the job is done right the first time. Contact us to learn about our installation services and enjoy a seamless upgrade from day one.

FAQ

Shipping Information
For items that are in stock, purchases made after 9am EST will be usually be shipped out in the next 1-2 business days. Please inquire to confirm lead times if you have specific time constraints. Orders will be sent via signature required at our discretion unless otherwise requested.

International Shipping
Any and all customs duties, taxes, import fees, and/or tariffs assessed in connection with the purchase shall be the sole responsibility of the customer/end user.

Return Policy
We have a 30-day return policy, which means you have 30 days after receiving your item to request a return. To be eligible for a return, your item must be in the same condition that you received it, unused and in its original packaging. All returns are subject to a restocking fee based on item and package condition. Buyer is responsible for paying for return shipping costs. If you need a return label, we will email you a return label and deduct cost from refund. Original shipping costs are not refundable. Special order items are not eligible for return.

Cancellation Policy
In order to cancel your order you must email within 24 hours of placing your order or before your order has shipped, whichever occurs first. Special order items are not eligible for cancelation.

Exchange Policy
We have a 30-day exchange policy, which means you have 30 days after receiving your item to request an exchange. To be eligible for an exchange, your item must be brand new in box. Buyer is responsible for paying all shipping costs to exchange product.

Product Description

The Fabspeed Muffler Bypass Pipe is a true muffler delete system for air-cooled Porsche 911 SC and 3.2 Carrera (1976–1989), replacing the heavy OEM “cigar-style” rear muffler with a straight-through design. This results in significant weight reduction, improved exhaust flow, and a raw, race-inspired exhaust note that transforms the driving experience. The included adjustable turndown tip allows you to fine-tune sound direction and perceived volume, making it one of the most aggressive yet simple bolt-on upgrades for classic 911s.

Fitment Notes

  • Fits Porsche 911 SC 3.0L and 3.2 Carrera (1976–1989)
  • Replaces factory rear muffler (primary muffler delete)
  • Compatible with stock or aftermarket catalytic converters / pre-mufflers
  • Considered a cat-back modification (emissions unaffected)

Included

  • Straight-through muffler bypass pipe assembly
  • Adjustable 90° turndown exhaust tip
  • Mounting flanges and hardware for bolt-on installation

Product Specs

  • Power Gains: ~+10–12 hp / +8–10 lb-ft torque
  • Weight Savings: ~18–20 lbs reduction vs OEM muffler
  • Construction: Mandrel-bent T304 stainless steel
  • System Type: Primary muffler delete
  • Installation: Direct bolt-on

Product Features

  • Maximum sound increase: Delivers a raw, loud, air-cooled flat-six tone with race-inspired character
  • Significant weight reduction: Removes one of the heaviest rear components on classic 911s
  • Improved throttle response: Reduced backpressure allows the engine to rev more freely
  • Adjustable sound direction: Turndown tip lets you aim exhaust flow to manage volume perception
  • Simple install: Direct replacement using factory mounting points
  • Track-proven design: Popular choice for vintage track builds and aggressive street setups