Porsche 991.1 Carrera S / Carrera 4S / GTS SOUL Street Package

Product Description

The SOUL Street Package is a complete performance exhaust solution for Porsche 991.1 Carrera S, Carrera 4S, and GTS models, combining SOUL's Long Tube Street Headers with its Valved Performance Exhaust System for a comprehensive upgrade from the cylinder heads through the rear exhaust.

The package replaces the restrictive factory header and catalyst assemblies with performance-oriented long-tube headers and high-flow catalytic converters, while the rear exhaust provides a straight-through 2.5-inch valves-open flow path, X-pipe crossover, and acoustically tuned Helmholtz resonators.

With the valves open, the system delivers dramatically greater flat-six sound, stronger throttle response, increased exhaust flow, and additional crackles and burbles. Close the valves and exhaust is routed through the factory Porsche side mufflers for a significantly quieter and more refined driving experience.

Vehicles equipped with factory Porsche Sport Exhaust / PSE retain the original Porsche exhaust-valve controls. Compatible Carrera S / GTS vehicles without PSE can instead be equipped with SOUL's dedicated Valve Controller Kit.

FITMENT:

• Fits 2012–2016 Porsche 991.1 911 Carrera S Coupe – 3.8L

• Fits 2012–2016 Porsche 991.1 911 Carrera S Cabriolet – 3.8L

• Fits 2012–2016 Porsche 991.1 911 Carrera 4S Coupe – 3.8L

• Fits 2012–2016 Porsche 991.1 911 Carrera 4S Cabriolet – 3.8L

• Fits applicable 2014–2016 Porsche 991.1 911 Targa 4S – 3.8L

• Fits 2015–2016 Porsche 991.1 911 Carrera GTS Coupe – 3.8L

• Fits 2015–2016 Porsche 991.1 911 Carrera GTS Cabriolet – 3.8L

• Fits 2015–2016 Porsche 991.1 911 Carrera 4 GTS Coupe – 3.8L

• Fits 2015–2016 Porsche 991.1 911 Carrera 4 GTS Cabriolet – 3.8L

• Fits 2015–2016 Porsche 991.1 911 Targa 4 GTS – 3.8L

• Compatible with factory Porsche Sport Exhaust / PSE

• Compatible with applicable non-PSE Carrera S / GTS vehicles when configured with the SOUL Valve Controller

• Compatible with manual and PDK-equipped vehicles where applicable

PACKAGE INCLUDES:

• SOUL Long Tube Street Headers

• High-flow performance catalytic converters

• SOUL Valved Performance Exhaust System

• 2.5-inch valves-open performance exhaust path

• X-pipe crossover

• Helmholtz anti-drone resonators

• Exhaust valves and associated hardware

• Selected exhaust-tip configuration

• SOUL Valve Controller Kit when ordered for a non-PSE vehicle

• New high-grade installation hardware

LONG TUBE STREET HEADERS:

The Street Package begins by replacing the factory Porsche header and catalyst assemblies with SOUL's Long Tube Street Headers.

The long-tube architecture is designed to improve:

• Exhaust scavenging

• Exhaust-gas velocity

• Low- and midrange torque

• Throttle response

• High-RPM breathing

• Naturally aspirated flat-six sound

• Overall exhaust-flow capacity

SOUL's Street Headers retain catalytic converters rather than converting the vehicle to a completely catless configuration, making this the more street-oriented complete exhaust package.

DESIGNED AROUND THE 3.8L ENGINE:

The Carrera S, Carrera 4S, and 991.1 GTS use Porsche's naturally aspirated 3.8-liter flat-six.

SOUL's long-tube header architecture was specifically developed with the flow requirements of this engine in mind.

The combination of optimized header runners and a freer-flowing rear exhaust helps the 3.8L engine breathe more efficiently throughout the usable RPM range.

Expected benefits include:

• Sharper throttle response

• Greater midrange torque

• Improved high-RPM breathing

• Reduced exhaust restriction

• Stronger engine response

• More prominent naturally aspirated flat-six character

HIGH-FLOW CATALYTIC CONVERTERS:

The Street Package retains a catted exhaust configuration.

SOUL uses large, high-flow performance catalytic converters to reduce restriction compared with the original Porsche catalyst assemblies while maintaining a more street-oriented configuration than its Competition Headers.

The catalyst sections are designed to complement the long-tube runner architecture rather than becoming a major restriction immediately downstream of the collectors.

VALVED PERFORMANCE EXHAUST:

Downstream of the headers, SOUL's Valved Performance Exhaust gives the Carrera two distinct exhaust personalities.

The rear system incorporates:

• 2.5-inch performance piping

• Smooth-radius bends

• X-pipe crossover

• Tuned Helmholtz resonators

• Vacuum-operated exhaust valves

• Factory Porsche side mufflers as the quieter exhaust route

This provides substantially greater sound and flow when desired while retaining useful cruising refinement.

VALVES OPEN:

With the valves open, exhaust gases are given a straight and essentially unrestricted path through the 2.5-inch performance exhaust.

Expect:

• Dramatically increased exhaust volume

• Stronger naturally aspirated flat-six sound

• Sharper throttle-related character

• Greater high-RPM intensity

• Additional crackles and burbles during deceleration

• More immediate engine response

• Cup Car-inspired exhaust character

• Significantly more aggression than the factory PSE system

This is the system's full performance mode.

VALVES CLOSED:

With the valves closed, exhaust is routed through the original Porsche side mufflers.

The factory mufflers continue to provide substantial sound attenuation, allowing the car to retain a much more restrained personality.

Expect:

• Significantly lower overall volume

• Refined cruising characteristics

• Reduced cabin presence

• Minimal undesirable drone

• Comfortable highway operation

• Retention of recognizable flat-six sound

This wide separation between quiet and aggressive operation is a major advantage of the Street Package.

FACTORY PSE INTEGRATION:

Vehicles already equipped with Porsche Sport Exhaust reuse Porsche's original valve-control system.

This configuration retains:

• Factory PSE controls

• Factory PSE button functionality

• Porsche's existing vacuum-control architecture

• Factory-style valve operation

• No separate SOUL Valve Controller requirement

This is the simplest installation option for PSE-equipped Carrera S and GTS models.

NON-PSE S / GTS CONFIGURATION:

Compatible Carrera S / GTS models without factory PSE can use the same Street Package with SOUL's Valve Controller Kit.

The Valve Controller adds independent exhaust-valve control to vehicles that do not already have the necessary Porsche control system.

This allows non-PSE customers to retain the same basic:

Valves Open / Aggressive

and

Valves Closed / Refined

functionality as PSE-equipped vehicles.

VALVE CONTROLLER INSTALLATION:

Installing the SOUL Valve Controller on a non-PSE car requires additional work beyond the basic mechanical exhaust installation.

SOUL specifies that installation requires:

• Rear bumper removal

• Locating and tapping an appropriate switched 12V power source

• Electrical installation of the controller

• Installation of vacuum lines

• Connection to the exhaust valves

Professional installation is strongly recommended for the Valve Controller configuration.

X-PIPE CROSSOVER:

The rear exhaust incorporates a performance X-pipe that allows exhaust pulses from the opposing cylinder banks to interact.

Benefits include:

• Smoother exhaust tone

• Greater left-to-right bank blending

• Improved exhaust-scavenging potential

• Improved volumetric-efficiency potential

• More cohesive naturally aspirated sound

The X-pipe contributes to sound quality with the valves both open and closed.

HELMHOLTZ ANTI-DRONE RESONATORS:

SOUL identified approximately:

3,000–3,500 RPM

as an inherent resonance range on the 991.1 Carrera when higher-flowing exhaust components are installed.

This can become particularly noticeable on PDK-equipped cars that spend significant time cruising within that RPM range.

SOUL incorporates tuned Helmholtz resonators to target those undesirable frequencies.

Unlike a conventional muffler, the Helmholtz chambers attenuate specific sound frequencies without forcing the main exhaust stream through additional restrictive material.

This helps provide:

• Reduced highway drone

• Comfortable PDK cruising

• Smoother valves-open operation

• Smoother transition between valve positions

• High exhaust-flow capability

PACKAGE-LEVEL DYNO RESULTS:

SOUL conducted Dynojet testing of the Street Package hardware on a 991.1 Base Carrera.

With the Street Package hardware installed and without an ECU tune, SOUL recorded maximum gains of approximately:

+26.5 wheel horsepower

and

+36 lb-ft of torque

at approximately:

4,250 RPM

SOUL then added ECU calibration and reported total gains of approximately:

+44.1 wheel horsepower

and

+50.13 lb-ft of torque

The larger tuned figures represent the combined Street Package plus ECU calibration, not hardware-only gains.

Because SOUL's published test vehicle was a Base Carrera rather than a 3.8L Carrera S or GTS, these figures should be treated as manufacturer test data demonstrating the package's performance potential rather than guaranteed S/GTS gains.

THROTTLE RESPONSE & MIDRANGE PERFORMANCE:

The Street Package addresses restriction at both major ends of the exhaust system.

The long-tube headers improve flow immediately out of the engine, while the freer-flowing valved rear exhaust reduces restriction farther downstream.

The combined system is designed to improve:

• Throttle response

• Low- and midrange acceleration

• Exhaust scavenging

• High-RPM breathing

• Naturally aspirated engine character

• Overall driving engagement

WITH FACTORY PSE:

For factory-PSE cars, the Street Package retains the familiar Porsche valve-control experience while dramatically increasing the difference between the exhaust modes.

With the valves closed, the car remains restrained enough for normal driving.

With the valves open, the freer-flowing headers and straight-through rear exhaust substantially increase volume and character.

WITH SOUL STREET HEADERS + VALVES OPEN:

The complete package is significantly more aggressive than installing either the rear exhaust or headers alone.

Expect:

• Strong naturally aspirated engine presence

• More pronounced midrange growl

• Greater high-RPM wail

• Increased crackles and burbles

• More immediate throttle-related sound

• Cup Car-inspired character

WITH THE VALVES CLOSED:

The factory side mufflers continue providing useful sound attenuation despite the freer-flowing long-tube headers upstream.

The car therefore retains a meaningful quiet mode for:

• Highway trips

• Residential areas

• Early-morning driving

• Long-distance cruising

• Situations where maximum exhaust volume is undesirable

STREET PACKAGE VS. INDIVIDUAL COMPONENTS:

The Street Package combines:

SOUL Long Tube Street Headers

with

SOUL Valved Performance Exhaust

Rather than upgrading the exhaust one section at a time, this provides a matched performance package from the cylinder heads through the rear exhaust.

The combination delivers:

• High-flow catted headers

• Long-tube exhaust architecture

• Valved sound control

• 2.5-inch valves-open flow path

• X-pipe crossover

• Helmholtz anti-drone technology

• Factory PSE integration or optional SOUL valve control

STREET PACKAGE VS. COMPETITION CONFIGURATION:

Street Package

• High-flow catalytic converters

• Long-tube headers

• Valved rear exhaust

• 2.5-inch valves-open path

• Quiet mode retained

• Factory PSE compatibility

• Better street-oriented usability

• Lower catalyst-related diagnostic concerns

Competition Configuration

• Catless headers

• Maximum upstream flow

• Greater exhaust volume

• Reduced catalyst-related heat

• Greater emissions and diagnostic considerations

• More competition-focused character

For a street-driven Carrera S or GTS, the Street Package provides a strong balance between performance, sound, and everyday usability.

EXHAUST TIP OPTIONS:

Four tip configurations are available:

Reuse Factory Tips

Retains the original Porsche exhaust outlets for the most factory-like exterior appearance.

Polished Chrome

Bright polished finish for a traditional Porsche-inspired appearance.

Carbon Fiber

A darker, motorsport-inspired finish.

Black Chrome

Premium dark metallic finish for a more understated and aggressive rear appearance.

EMISSIONS NOTE:

The SOUL Street Package retains catalytic converters but replaces the original Porsche catalyst assemblies with aftermarket performance components.

The system is not CARB certified.

Customers are responsible for determining compliance with applicable federal, state, and local emissions regulations before installation or use.