Porsche 991.1 / 991.2 GT3 / GT3 RS / 911R SOUL Bolt-On Resonated Turn Down Exhaust Tips

Product Description

The SOUL Bolt-On Resonated Turn Down Exhaust Tips are a track-focused solution for Porsche 991.1 and 991.2 GT3 / GT3 RS models and the 911R, designed to help reduce measured exhaust sound at circuits and autocross events with increasingly strict noise limits.

Rather than relying on simple downward-facing tips alone, SOUL incorporates straight-through stainless-steel race resonators into the replacement tip assembly. This combination reduces exhaust sound while maintaining a large, unrestricted flow path intended to minimize any effect on engine performance.

The removable turn-down outlets are attached to the resonators with V-band clamps, allowing them to be quickly loosened and rotated so exhaust can be directed away from trackside sound-monitoring equipment.

SOUL measured a 3–4 dB reduction during one real-world test at 50 feet under wide-open throttle above 7,000 RPM compared with the standard exhaust tips. Actual sound reduction will vary substantially depending on exhaust configuration, measurement distance, microphone angle, weather, track layout, and other conditions.

The complete assembly bolts directly to the factory center muffler—or an aftermarket exhaust that accepts the factory tip mounting plate—and can be swapped on and off in minutes at the track.

FITMENT:

• Fits 2014–2016 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 Touring

• Fits 2019 Porsche 991.2 911 GT3 RS

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

• Fits vehicles using the factory Porsche center muffler

• Fits applicable aftermarket center mufflers or bypass systems that retain the factory exhaust-tip mounting interface

DETAILS:

• Track-oriented sound-reduction exhaust-tip assembly

• Designed to help vehicles comply with restrictive track sound limits

• Incorporates straight-through race resonators

• Includes removable / adjustable turn-down outlets

• Turn-down tips attach using V-band clamps

• Turn-down outlets can be rotated to direct exhaust away from sound-monitoring equipment

• Turn-down outlets are optional to run

• Resonated assembly can be used without the turn-down outlets installed

• Minimum internal piping diameter of approximately 61 mm

• Factory center-muffler exit openings measure approximately 59–60 mm

• SOUL designed the system to minimize restriction compared with the factory exhaust outlet

• SOUL reports little to no performance impact from the straight-through resonator design

• Real-world testing recorded a 3–4 dB reduction in one specific test configuration

• Factory tip assembly attaches with only three nuts

• Designed for rapid installation and removal at the track

• No cutting required

• No welding required

• No ECU calibration required

• No modification to catalytic converters

• No modification to oxygen sensors

• No modification to exhaust valves

• Bracket components are precision laser cut

• Brackets are hand finished

• V-band clamps included

• SOUL race resonators use full stainless-steel construction

• Designed for repeated track use

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

DEVELOPED FOR TRACK SOUND LIMITS:

Sound restrictions have become increasingly common at race tracks throughout the United States and internationally.

Highly modified GT3s can exceed those limits, and at particularly restrictive facilities even otherwise stock vehicles may encounter difficulty passing sound checks.

SOUL developed this system after receiving requests from customers participating at venues and events including:

• Lime Rock Park

• WeatherTech Raceway Laguna Seca

• Circuit Mont-Tremblant

• SCCA Autocross events

The goal was to create a solution that could be quickly installed at the track without permanently changing the vehicle's normal exhaust configuration.

MORE THAN A SIMPLE TURN-DOWN:

A conventional turn-down tip attempts to reduce measured sound primarily by redirecting exhaust energy toward the ground or away from a sound meter.

SOUL found that simple turn-down outlets may not provide sufficient reduction in every situation.

The Resonated Turn Down system therefore combines two strategies:

Straight-Through Race Resonators

These attenuate exhaust sound while maintaining a relatively unrestricted flow path.

Directional Turn-Down Outlets

These allow exhaust to be directed downward or away from trackside sound-monitoring equipment.

The result is a more comprehensive sound-management solution than a basic slip-on turn-down tip.

STRAIGHT-THROUGH RACE RESONATORS:

The integrated SOUL race resonators are designed around a straight-through internal flow path.

The minimum inside diameter is approximately:

61 mm

For comparison, SOUL measured the factory center muffler's outlet openings at approximately:

59–60 mm

The resonated assembly therefore maintains an internal diameter comparable to or slightly larger than the factory center-muffler outlets.

This allows the resonators to attenuate sound without introducing a dramatically smaller exhaust restriction.

REAL-WORLD SOUND TESTING:

SOUL documented one test using a Porsche running:

• Factory headers

• Factory side mufflers

• Aftermarket center muffler bypass

At approximately:

50 feet

under:

Wide-open throttle above 7,000 RPM

SOUL measured approximately:

3–4 dB less sound

with the Resonated Turn Down Exhaust Tips compared with the standard exhaust tips.

A 3–4 dB reduction can be meaningful at a track where a vehicle is operating close to the venue's maximum allowable sound level.

SOUND REDUCTION IS NOT GUARANTEED:

SOUL specifically warns that a fixed amount of sound reduction cannot be guaranteed.

Sound measurements are affected by many factors, including:

• Distance from the microphone

• Microphone angle

• Exhaust configuration

• Headers

• Catalytic converters

• Center muffler configuration

• Side muffler configuration

• Engine load

• Engine RPM

• Vehicle speed

• Surrounding terrain

• Buildings and reflective surfaces

• Weather conditions

• Track measurement procedure

The documented 3–4 dB result should therefore be treated as a specific real-world test result rather than a guaranteed reduction for every car or venue.

PROVEN TRACK APPLICATION:

SOUL also reports that the Resonated Turn Down Exhaust Tips have been used with a factory exhaust to meet strict sound restrictions at Bilster Berg Circuit in Germany.

This demonstrates that the system can be useful even for vehicles that are not running an aggressively modified exhaust.

ADJUSTABLE TURN-DOWN DIRECTION:

The turn-down outlets are attached to the resonators using V-band clamps.

Unlike conventional slip-on turn-downs that can become difficult to reposition after repeated heat cycles, the V-band design allows the outlet to be loosened and rotated when necessary.

This gives the driver or crew the ability to orient the exhaust outlets:

• Downward

• Away from a trackside microphone

• Away from a specific sound-control station

The appropriate orientation will depend on the track's sound-measurement location and procedure.

TURN-DOWNS ARE REMOVABLE:

The directional turn-down outlets themselves are optional.

They can be removed while leaving the straight-through resonated assembly installed.

This gives the owner additional flexibility depending on:

• Track sound requirements

• Exhaust configuration

• Desired sound level

• Outlet direction requirements

QUICK TRACKSIDE SWAP:

The factory exhaust-tip assembly is held in place with only three nuts.

SOUL designed the Resonated Turn Down Exhaust Tips around the same mounting architecture, allowing the assemblies to be exchanged quickly.

This makes it practical to:

• Drive to the track with standard tips

• Install the resonated turn-down assembly before going on circuit

• Run the sound-restricted event

• Reinstall the normal tips afterward

The system therefore does not require the owner to permanently compromise the vehicle's normal appearance or exhaust sound.

FACTORY CENTER MUFFLER COMPATIBILITY:

The assembly bolts directly to the factory Porsche center muffler.

No modification to the center muffler is required.

The original:

• Side mufflers

• Exhaust valves

• Headers

• Catalytic converters

• Oxygen sensors

can remain untouched.

AFTERMARKET EXHAUST COMPATIBILITY:

The Resonated Turn Down Tips can also be used with an aftermarket muffler or center-muffler bypass that accepts the factory Porsche exhaust-tip mounting plate.

This makes the system compatible with a range of exhaust combinations without requiring a dedicated version for each downstream exhaust configuration.

Fitment should be verified if the aftermarket exhaust replaces or alters the factory tip mounting interface.

WITH SOUL CENTER MUFFLER BYPASS:

The product is particularly useful on vehicles equipped with an aggressive center-muffler bypass.

A Center Muffler Bypass substantially increases exhaust volume and may create problems at sound-restricted tracks.

The Resonated Turn Down Tips provide a temporary way to reduce measured output while retaining the performance-oriented center-muffler configuration.

WITH FACTORY EXHAUST:

Even vehicles retaining the factory Porsche exhaust can encounter restrictive sound limits at certain circuits.

The Resonated Turn Down system can be installed on the factory center muffler without requiring any other exhaust modification.

PERFORMANCE IMPACT:

SOUL engineered the system specifically to reduce sound while minimizing exhaust restriction.

The resonators use a straight-through design, and the system's minimum internal diameter is approximately:

61 mm

compared with approximately:

59–60 mm

at the factory center-muffler exits.

SOUL therefore reports little to no impact on performance from the resonated assembly.

No specific horsepower-loss figure is published, so DasMotoring does not advertise a numerical power change.

CONSTRUCTION:

The system is intended to withstand repeated installation, removal, heat cycling, and track use.

Construction includes:

• Full stainless-steel race resonators

• Laser-cut bracket components

• Hand-finished brackets

• V-band-mounted turn-down outlets

• Included V-band clamps

The V-band attachment is particularly useful for a component expected to be adjusted or removed repeatedly at track events.

NO ECU TUNING REQUIRED:

The Resonated Turn Down Tips install at the very rear of the exhaust system.

They do not modify:

• Catalytic converters

• Oxygen sensors

• ECU calibration

• Factory exhaust valves

No ECU calibration is required for installation.

NO EMISSIONS-SYSTEM CHANGES:

This product does not remove or modify the factory emissions-control equipment.

Any emissions implications associated with the vehicle depend on the rest of the installed exhaust system rather than these resonated exhaust tips.