Fabspeed Exhaust


- Porsche 991 GT3 3.8L (475Bhp)

Superb dual-tone sports car sound; throaty and deep at idle and medium speeds
FEATURES:
• Fits: all Porsche 991 GT3 vehicles 2014+
• Mini Maxflo mufflers are radius stress relieved, hydro-formed cases that are pulse TIG welded using 2000 degree ceramic fiber and stainless steel wool packing.
• Constructed from high quality 14-16 gauge, C.N.C. mandrel bent T304L stainless steel
• Retains Sport Mode button functionality when used in conjunction with factory side mufflers
• Simple bolt-on installation
• 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
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FSPOR991GT3CMAX
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- Porsche 991 GT3 3.8L (475Bhp)
- Porsche 991 GT3 RS 4.0L (500Bhp)
The ultimate lightweight cat-back exhaust system for the 991 GT3 / GT3 RS saves 54lbs (24kg) off the rear of the vehicle and is perfect for competitive track use, high performance drivers education events, or aggressive street sound.
FEATURES:
• Fits all Porsche 991 GT3 / GT3 RS models (2014-2016)
• Perfect exhaust solution for maximum performance and sound during competitive track use, high performance drivers education events, or simply achieving an aggressive and exciting street sound.
• Saves over 54lbs (24kg) from the rear of the 991 GT3 which improves handling and acceleration by replacing the bulky factory center muffler and side mufflers
• Engineered and manufactured with 3" (76mm) T304L stainless steel tubing with integral tuned center X-Pipe to 70mm outlets.
• Bolt-on installation' no cutting or welding required
• Includes two (2) 90 degree Turndown Tips for track use.
• All Fabspeed performance products are backed by Fabspeed's Lifetime Warranty
NOTE: This is a straight pipe, racing oriented exhaust system built to be light and make power. As a result, the volume level will be very high inside the vehicle.
Please note: sports catalytic converters or bypass pipes do have type approval and may not be legally installed on vehicles manufactured after 1st March 2001. They can not be used on a public road and are not MOT compliant, they are designed for race and track cars only.
Related reference numbers
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FSPOR991GT3CRX
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- Porsche 991 GT3 3.8L (475Bhp)
Replaces factory center muffler for improved flow, increased power, and aggressive sound.
FEATURES:
• Fits all Porsche 991 GT3 vehicles 2014+
• Saves 10 lbs from the rear of the vehicle
• Retains Sport Mode control button when used with factory side mufflers
• 14-16ga T304 Stainless Steel construction
• Includes 4" Deluxe Tips in Polished or Matte Black finish
• 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.
FSPOR991GT3CMB
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- Porsche 991 GT3 3.8L (475Bhp)

Larger 4" bolt-on replacements for the smaller factory exhaust tips
FEATURES:
• Fits: all Porsche 991 GT3 vehicles 2014+
• Available in Polished Chrome, Matte Black, and Carbon Fiber finishes
• Compatible with all Fabspeed exhaust systems as well as the OEM mufflers
• Simple DIY installation; installs in 10 minutes
• 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.
FSPOR991GT3DLTCF
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- Porsche 991 GT3 3.8L (475Bhp)

Larger 4" bolt-on replacements for the smaller factory exhaust tips
FEATURES:
• Fits: all Porsche 991 GT3 vehicles 2014+
• Available in Polished Chrome, Matte Black, and Carbon Fiber finishes
• Compatible with all Fabspeed exhaust systems as well as the OEM mufflers
• Simple DIY installation; installs in 10 minutes
• 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.
FSPOR991GT3DLTB
The product you are viewing cross references to these numbers





- Porsche 991 GT3 3.8L (475Bhp)

Larger 4" bolt-on replacements for the smaller factory exhaust tips
FEATURES:
• Fits: all Porsche 991 GT3 vehicles 2014+
• Availiable in Polished Chrome, Matte Black, and Carbon Fiber finishes
• Compatible with all Fabspeed exhaust systems as well as the OEM mufflers
• Simpe DIY installation; installs in 10 minutes
• 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.
FSPOR991GT3DLTP
The product you are viewing cross references to these numbers





- Porsche 991 GT3 3.8L (475Bhp)

Fabspeed's 991 GT3 Side Muffler Bypass Pipes are also available without valves for those that desire maximum weight savings and performance, and do not need the sound level control.
FEATURES:
• Fits: all Porsche 991 GT3 vehicles (2013+)
• Saves 34lbs from the rear of the vehicle
• Replicates aggressive CUP car sound for the street
• 14-16ga T304 Stainless Steel construction
• Simple bolt-on installation
• 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.
FSPOR991GT3SMB
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- Porsche 991 GT3 3.8L (475Bhp)

Direct replacement for the restrictive OEM headers, offering improved power and throttle response throughout the RPM range.
FEATURES:
• Fits: all Porsche 991 GT3 vehicles 2014+
• Includes German-imported HJS 200-Cell Tri-Metallic Sportcats
• Saves 2lbs from the rear of the vehicle
• CNC mandrel-bent 1pc primary header tubes
• High-velocity motorsports-style merge collector
• Constructed from T304 Stainless Steel
• All Fabspeed performance products are backed by the Fabspeed Lifetime Limited Warranty
NOTE: Fabspeed's 200-cell high-flow catalytic converters are not C.A.R.B. certified and are for Off-Road Use ONLY in the state of California
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.
NOTE: Sports catalytic converters and bypass pipes do not have type approval and are not legally permitted for use on vehicles manufactured after 1st March 2001 in the United Kingdom. They are not MOT compliant and must not be used on public roads. These components are intended for race and track use only. If you are located outside the UK, please consult your local laws and regulations to ensure compliance.
Related reference numbers
Related, superseded, cross reference or alternative numbers for comparison.
FSPOR991GT3SHDR
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- Porsche 991 GT3 3.8L (475Bhp)
- Porsche 991 GT3 RS 4.0L (500Bhp)
The ULTIMATE OEM style high performance replacement muffler for your GT3
FEATURES:
• Fits all Porsche 991 GT3 / GT3 RS vehicles 2014-2016 worldwide
• Constructed from CNC cut T304L stainless steel
• Designed from 3D scans of the OEM muffler so we can achieve perfect bolt-on fitment
• Will not break or crack like OEM GT3 mufflers do
• Incorporates our signature cast X-pipe for superior flow and exhaust scavenging
• Paired with our Side Muffler Bypass Pipes this muffler adds +27 ft/lbs of TQ and +16 WHP or +18 HP at the crank!
• 4 different tip options available
• Completely retains PSE valved exhaust functionality
• No Check Engine Light guaranteed
• This cat-back system is emissions legal in all 50 states and the rest of the world
• Built in house at Fabspeed Motorsport USA in Fort Washington, PA
• Simple bolt-on installation, no cutting or welding required
• All Fabspeed performance products are backed by the Fabspeed Lifetime Warranty
As many GT3 owners know, the OEM mufflers are prone to cracking, breaking and blowing out, particularly the titanium mufflers on GT3RS cars. We wanted to design a muffler replacement that not only fixed that issue but also improved on the OEM design. Using our 25+ years of air and water-cooled experience, we took the valve open tubing to 2.75in / 70mm which is the optimal diameter for GT3 engines to have low restriction but maintain high velocity and high GT3 pitch for the signature GT3 CUP car sound. Then, we implemented our signature investment cast X-Pipe for optimal exhaust scavenging. The X merges the two cylinder banks without creating any restriction in exhaust flow. To maintain the factory muffler’s exhaust note and lack of drone, we mimicked Porsche’s 7 chamber design. This makes for a completely drone free muffler, even when running catless race headers! Pair this with Fabspeed Side Muffler Muffler Bypass Pipes for the ultimate emissions compliant GT3 exhaust. This muffler is guaranteed to NEVER BREAK or fail.
SOUND:
This muffler will have a very similar tone to the OEM muffler, however, it will be a bit louder with PSE turned on. It will also sound a bit smoother and higher pitched thanks to our signature X-pipe.
POWER:
On our 991.1 GT3RS test car, paired with Fabspeed Side Muffler Muffler Bypass Pipes, the Rennsport Muffler picked up an impressive 27 ft/lbs of TQ down low at 3,200 RPM. From 2,900 RPM all the way to 5,700 RPM it picks up 10 WHP or more, and peak WHP is up from 446 to 454! That’s a gain of 8 WHP or 9 HP at the crank.
NOTE:
• Requires OEM gaskets and hardware to be reused
• If they are not available here are the necessary part numbers.
• 2x Muffler band straps (99711111970)
• 2x Bolt for muffler band strap (90006736201)
• 2x Each Side Muffler to Center Muffler Gaskets (99711156390, 99711156190)
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.
FSPOR991GT3RSM
The product you are viewing cross references to these numbers


