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SKU: POR.991GT3.SMBV
Fabspeed Porsche 991 GT3 / GT3 RS Side Muffler Bypass Pipes (2014-2016)
Fabspeed Side Muffler Bypass Pipes replace the factory side mufflers on 2014-2016 Porsche 991 GT3 and GT3 RS models. These pipes improve exhaust flow for better performance deliver a louder aggressive exhaust note and cut 34 lbs from the rear end. Pair them with Fabspeed Long Tube Competition Headers for full exhaust flow from the 3.8L or 4.0L flat-six engine.
Key Features
- Precise Fitment: Designed for all 2014-2016 Porsche 991 GT3 and GT3 RS vehicles with direct bolt-on installation
- Helical Valves: Premium helical internal valves control sound and flow for track or street driving
- O2 Sensor Bungs: Built-in bungs maintain factory ECU functionality especially with Fabspeed Long Tube Competition Headers
- Weight Reduction: Saves 34 lbs from the rear of the vehicle improving handling and acceleration
- CUP Car Sound: Delivers the raw aggressive exhaust tone of Porsche GT3 Cup race cars right on the street
- Construction: Mandrel-bent 14-16 gauge T304 stainless steel for durability and corrosion resistance
- Warranty: Backed by Fabspeed lifetime structural warranty on welds and material defects
Product Notes
- Valves controlled via factory Porsche Homelink or aftermarket remote for open or closed positions
- Clean regularly with mild soap to preserve stainless steel finish and prevent carbon buildup
- Boxed dimensions 48 x 14 x 12 inches for secure transit
Installation Notes
- Professional installation recommended.
- Bolt-on design uses factory mounting points no welding or cutting required
- Compatible with factory cats or Fabspeed headers O2 extensions may be needed for catless setups
This Part Fits
| Year | Make | Model | Submodel |
|---|---|---|---|
| 2014 | Porsche | 911 | GT3 (991) |
| 2015 | Porsche | 911 | GT3 (991) |
| 2016 | Porsche | 911 | GT3 (991) |
| 2016 | Porsche | 911 | GT3 RS (991) |
Why Choose Fabspeed?
- Over 30 years crafting Porsche-specific exhaust systems in Philadelphia USA
- Handmade T304 stainless steel components for exact fit and long-lasting performance
- Engineered for maximum flow and sound on 991 GT3 platforms with dyno-tested results
Frequently Asked Questions
-
Q: Will this fit both GT3 and GT3 RS models?
A: Yes fits all 2014-2016 Porsche 991 GT3 and 2016 GT3 RS with identical side muffler mounts -
Q: What material is used in construction?
A: 14-16 gauge T304 stainless steel tubing with helical valves for strength heat resistance and mirror polish finish -
Q: What warranty coverage is provided?
A: Lifetime warranty against structural defects welds and material failure when installed by certified shop
Shipping & Handling
- Method: UPS Ground or FedEx Ground
- Availability: In stock - ships same or next business day
- Packaging: Double-walled cardboard box 48 x 14 x 12 inches with foam protection
- Weight: Boxed weight 28 lbs
Fabspeed
Fabspeed Motorsport is a Pennsylvania-based performance parts manufacturer that specializes in exhaust systems, sport catalytic converters, headers, downpipes, intake systems, and carbon fiber components engineered specifically for exotic and high-performance European sports cars including Porsche, Ferrari, Lamborghini, McLaren, BMW M, and Audi R8. Every Fabspeed product is TIG-welded from aerospace-grade stainless steel or titanium in the USA, dyno-tested for measurable power and sound improvement, and designed as a direct bolt-on replacement that preserves the factory catalytic converter monitoring system or provides an explicit sport cat solution for emissions-compliant upgrades. Exotic car owners who have already maximized software and cosmetic modifications choose Fabspeed exhaust systems because the brand's specialty focus on a narrow range of platforms produces fit quality and sound character that universal exhaust manufacturers cannot achieve. The brand's XperTune ECU calibr...
View Fabspeed Products
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