Porsche 991.1 / 991.2 GT3 / GT3 RS / 911R SOUL Center Muffler Bypass Exhaust

Product Description

The SOUL Center Muffler Bypass Exhaust is a direct bolt-on upgrade for Porsche 991.1 and 991.2 GT3 / GT3 RS models and the 911R, replacing the heavy factory center muffler with a freer-flowing T304L stainless-steel exhaust section while retaining the factory side mufflers and exhaust-valve functionality.

By removing the center muffler, the system releases substantially more of the naturally aspirated flat-six soundtrack without eliminating the factory car's ability to control exhaust volume. The original side mufflers and valves remain functional, allowing the driver to retain the factory Sport / exhaust-valve controls for quieter cruising.

The result is a deeper, more aggressive tone at lower engine speeds that builds into the characteristic high-RPM GT3 wail as the engine approaches redline.

The SOUL Center Muffler Bypass also removes approximately 11 lbs from the rear of the vehicle, making it a simple way to increase sound, reduce weight, and improve exhaust flow without replacing the headers, catalytic converters, or complete exhaust system.

FITMENT:

• Fits 2014–2012016 Porsche 991.1 911 GT3

• Fits 2016 Porsche 991.1 911 GT3 RS

• Fits 2016 Porsche 911R

• Fits 2018–2019 Porsche 991.2 911 GT3

• Fits 2018–2019 Porsche 991.2 911 GT3 with Touring Package

• Fits 2019 Porsche 991.2 911 GT3 RS

• SOUL specifies fitment for all 991.1 / 991.2 GT3 and GT3 RS models, including the 911R, from 2014–2019

• Compatible with the factory side mufflers

• Retains factory exhaust-valve functionality

• Compatible with the factory headers and catalytic converters

• Compatible with applicable upgraded headers

• Direct replacement for the factory center muffler

DETAILS:

• Direct bolt-on Center Muffler Bypass Exhaust

• Replaces the factory center muffler

• Retains the original Porsche side mufflers

• Retains factory exhaust valves

• Retains factory Sport / exhaust-valve control functionality

• Increases naturally aspirated flat-six exhaust volume

• Produces a deeper tone at lower RPM

• Produces a more aggressive high-RPM GT3 wail

• Particularly aggressive when paired with upgraded headers

• Removes approximately 11 lbs from the rear of the vehicle

• Constructed from mandrel-bent T304L stainless steel tubing

• Includes Mikalor Supra Heavy-Duty W4 clamps

• Mikalor clamps use high-strength stainless-steel hardware

• Includes AccuSeal clamps for connection to the factory side mufflers

• No cutting required

• No welding required

• No ECU programming required

• Straightforward installation suitable for experienced DIY enthusiasts

• Each exhaust is fixture-tested before shipment

• Foam-packed following final inspection

• No check engine lights occurred during SOUL's development and long-term road testing

• Six exhaust-tip configurations available

• Two 4-inch single-wall tip styles

• Three tip finishes

• Backed by SOUL Performance Products' Lifetime Warranty for street and track use

RETAINS FACTORY SIDE MUFFLERS:

The Center Muffler Bypass replaces only the large center muffler.

The original Porsche side mufflers remain installed and continue to provide sound attenuation when the factory exhaust valves command the quieter flow path.

This provides a useful balance between:

• Increased exhaust volume

• More aggressive flat-six character

• Factory-style sound control

• Daily-driving comfort

• Track-oriented sound when desired

For owners who want noticeably more sound without replacing the entire exhaust system, this is one of the simplest modifications available for the 991 GT3 platform.

FACTORY EXHAUST VALVE FUNCTIONALITY:

Unlike a complete muffler-delete system, the Center Muffler Bypass retains the original Porsche side mufflers and exhaust valves.

The factory exhaust controls therefore continue operating normally.

With the quieter exhaust mode selected, the side mufflers continue reducing overall volume.

With the aggressive exhaust mode selected, the vehicle reveals substantially more of the Center Muffler Bypass's freer-flowing sound.

This preserves a meaningful difference between the quieter and louder operating modes.

VALVES CLOSED:

With the factory valves in their quieter operating state, the retained side mufflers continue providing sound attenuation.

Expect:

• Relatively restrained cruising volume

• Comfortable highway behavior

• Reduced cabin presence

• Deeper tone than stock

• Retention of factory-style sound control

• Greater daily-driving usability than a full muffler-delete exhaust

SOUL specifically developed the Center Muffler Bypass to increase sound without sacrificing normal street comfort.

VALVES OPEN:

With the factory exhaust valves open, substantially more of the naturally aspirated flat-six character becomes audible.

Expect:

• Greater exhaust volume

• Deeper low- and midrange tone

• Stronger throttle-related sound

• Sharper high-RPM character

• Increased mechanical presence

• More pronounced GT3 wail

• Greater contrast between quiet and aggressive modes

At higher RPM, the system allows substantially more of the GT3 engine's natural exhaust note to reach the driver.

11-LB WEIGHT REDUCTION:

Replacing the factory center muffler removes approximately:

11 lbs

from the rear of the vehicle.

Reducing mass at the extreme rear of a 911 is particularly desirable because the engine and much of the vehicle's drivetrain mass are already concentrated behind the rear axle.

The Center Muffler Bypass therefore provides both an acoustic upgrade and a meaningful reduction in rear exhaust-system weight.

WITH FACTORY HEADERS:

When installed with the original Porsche exhaust manifolds and catalytic converters, the Center Muffler Bypass changes only the downstream center-muffler section.

The factory:

• Headers

• Catalytic converters

• Oxygen sensors

• Side mufflers

• Exhaust valves

remain installed.

This makes the Center Muffler Bypass an attractive first exhaust modification for an otherwise stock GT3.

WITH UPGRADED HEADERS:

SOUL specifically designed the Center Muffler Bypass to work well with upgraded headers.

Combining higher-flow headers with the Center Muffler Bypass creates a substantially more aggressive configuration with:

• Increased exhaust flow

• Greater overall volume

• More pronounced high-RPM sound

• Stronger race-derived character

• Continued use of the factory side mufflers and valves

The final volume will depend heavily on whether the headers retain catalytic converters.

SOUND CHARACTER:

With the Center Muffler Bypass installed, expect:

• Deeper exhaust tone at idle and lower RPM

• Greater flat-six presence around town

• Stronger engine character under load

• More audible transitions between exhaust-valve positions

• Aggressive high-RPM sound

• Exotic naturally aspirated wail approaching redline

• Considerably greater volume when paired with aftermarket headers

The system is intended to provide substantially more character without forcing the owner into a permanently extreme exhaust configuration.

DIRECT BOLT-ON INSTALLATION:

The Center Muffler Bypass is designed as a straightforward replacement for the factory center muffler.

Installation requires:

• Removal of the factory center muffler

• Installation of the SOUL bypass assembly

• Connection to the existing side mufflers

• Installation and adjustment of the supplied clamps

There is:

• No cutting

• No welding

• No ECU programming

• No catalyst modification

• No exhaust-valve deletion

SOUL describes the installation as suitable for experienced DIY enthusiasts.

MIKALOR HEAVY-DUTY CLAMPS:

SOUL supplies Mikalor Supra Heavy-Duty W4 clamps with the exhaust.

These stainless-steel clamps use:

• Projection-welded construction

• Swinging bridge design

• High-strength stainless-steel bolts

• Captive nut and trunnion architecture

The design provides high clamping force and long-term durability in a high-temperature exhaust environment.

ACCUSEAL SIDE-MUFFLER CONNECTIONS:

SOUL also includes AccuSeal clamps for the connections between the Center Muffler Bypass and the factory side mufflers.

This allows the system to be installed and adjusted without permanent modification to the original Porsche exhaust components.

CHECK ENGINE LIGHT:

The Center Muffler Bypass does not remove the factory catalytic converters or oxygen sensors.

SOUL reports that no check engine lights occurred during development or long-term road testing.

No ECU calibration is required simply to install the Center Muffler Bypass.

PERFORMANCE:

The Center Muffler Bypass reduces exhaust restriction compared with the factory center muffler and increases overall exhaust flow.

However, SOUL does not publish a verified standalone horsepower or torque figure for this product.

DasMotoring therefore does not advertise a numerical power increase.

The primary documented benefits are:

• Increased exhaust sound

• Reduced rear exhaust-system weight

• Freer exhaust flow

• Retained factory valve functionality

EXHAUST TIP OPTIONS:

The Center Muffler Bypass uses 4-inch single-wall exhaust tips.

Two styles are available:

4" Slash Cut Single Wall

An angled outlet providing a more aggressive appearance.

4" Straight Cut Single Wall

A traditional straight-cut circular outlet.

Each style is available in:

• Signature Satin

• Brushed

• Satin Black

This creates six total configurations.

SIGNATURE SATIN:

The Signature Satin finish provides a clean metallic appearance that complements the factory GT-car styling.

Price: $1,675.00

BRUSHED:

The Brushed finish provides a more textured stainless-steel appearance while retaining a natural metallic look.

Price: $1,675.00

SATIN BLACK:

The Satin Black finish provides the darkest and most aggressive appearance of the three available tip finishes.

Price: $1,855.00

EMISSIONS NOTE:

When installed with the factory headers and catalytic converters, the SOUL Center Muffler Bypass does not remove the original emissions-control components.

If the exhaust is later combined with aftermarket headers or catalyst-delete components, the emissions configuration of the vehicle may change.

Customers are responsible for determining compliance with applicable regulations for their complete vehicle configuration.