Porsche 991.1 / 991.2 GT3 / GT3 RS / 911R SOUL Street Headers

$6,495.00

Product Description

The SOUL Street Headers are designed for the Porsche 991.1 and 991.2 GT3 platform, replacing the restrictive factory header assemblies with a freer-flowing catted system engineered to improve power potential, throttle response, exhaust flow, and the sound of Porsche's high-revving naturally aspirated flat-six.

Even Porsche's GT3 exhaust system must balance performance against emissions requirements, packaging limitations, durability targets, and noise regulations. These constraints limit primary-runner length, runner diameter, and collector efficiency.

SOUL addresses these compromises with optimized runners, large-diameter free-flowing catalytic converters, and precision-machined billet stainless-steel head flanges and merge collectors.

The result is a more efficient exhaust path directly downstream of the cylinder heads, amplifying the character of whichever factory or aftermarket exhaust system is installed behind it while maintaining a catted configuration.

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 with Touring Package

• Fits 2019 Porsche 991.2 911 GT3 RS

• Compatible with the naturally aspirated 3.8L and 4.0L GT flat-six engines, depending on model

• Direct replacement for the factory header assemblies

• Compatible with the factory downstream exhaust system

• Compatible with applicable SOUL rear exhaust upgrades

• Single header configuration with no tip or transmission variants

DETAILS:

• Direct-replacement Street Header upgrade

• Retains a catted exhaust configuration

• Large-diameter, free-flowing catalytic converters

• Optimized primary-runner architecture

• Improved transition from the cylinder-head exhaust ports into the header runners

• Designed to reduce restriction compared with the factory header assemblies

• Designed to improve exhaust flow

• Designed to improve throttle response

• Designed to increase power potential

• Amplifies naturally aspirated flat-six sound through the downstream exhaust

• Billet 304L stainless-steel head flanges

• Billet 304L stainless-steel merge collectors

• Head flanges and merge collectors precision machined using 5-axis CNC equipment

• Constructed from mandrel-bent .065-inch-wall T304L stainless steel

• Back-purged TIG welded

• ARCAL Prime argon used during welding

• Thick-gauge aluminum welding fixtures minimize distortion

• Designed to withstand repeated aggressive street and track use

• Every set undergoes rigorous quality control prior to shipment

• Foam-packed following final inspection

• Designed and manufactured in-house by SOUL Performance Products in Willow Grove, Pennsylvania

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

WHY UPGRADE THE FACTORY HEADERS?

The GT3's factory exhaust is exceptionally capable, but Porsche still has to design the system around requirements extending beyond maximum performance.

Those compromises affect:

• Primary-runner length

• Primary-runner diameter

• Collector geometry

• Catalyst packaging

• Exhaust-flow capacity

• Sound

SOUL identifies the factory headers as one of the first areas to address when increasing exhaust performance on the 991 GT3 platform.

The Street Headers replace this section while preserving catalytic converters for a more street-oriented configuration than SOUL's Competition Headers.

OPTIMIZED RUNNER DESIGN:

The individual runners are designed to provide a more efficient path from each exhaust port into the collector.

Runner geometry plays an important role in naturally aspirated engine performance because exhaust pulses influence cylinder evacuation and scavenging.

A properly designed header can improve:

• Exhaust-gas velocity

• Exhaust scavenging

• Cylinder evacuation

• Throttle response

• Midrange performance

• High-RPM breathing

This becomes especially important on Porsche's high-revving GT engines, where exhaust-flow demand increases dramatically toward the upper end of the tachometer.

LARGE-DIAMETER PERFORMANCE CATALYSTS:

Unlike SOUL's Competition Headers, the Street Headers retain catalytic converters.

The headers are built around large-diameter, free-flowing performance catalysts intended to reduce restriction compared with the original Porsche assemblies.

This provides a balance between:

• Improved exhaust flow

• Increased performance potential

• Greater exhaust character

• Catted operation

SOUL's current product page does not specify a catalyst cell count, so DasMotoring does not advertise one for this product.

BILLET 304L HEAD FLANGES:

SOUL uses billet 304L stainless steel for the cylinder-head flanges.

These components are precision machined using 5-axis CNC equipment.

The billet flange design provides:

• Accurate exhaust-port transitions

• Precise runner alignment

• Increased strength

• Improved durability under repeated heat cycling

• Reduced likelihood of cracking in a high-stress area

This is particularly relevant for GT3s subjected to frequent track use, where the exhaust repeatedly cycles through extreme temperatures.

CNC-MACHINED MERGE COLLECTORS:

The individual runners converge through precision-machined 304L stainless-steel merge collectors.

Rather than treating the collector simply as a junction between several tubes, SOUL optimizes the transition for exhaust flow and durability.

The merge collector influences:

• Exhaust-pulse convergence

• Gas velocity

• Scavenging

• Throttle response

• High-RPM breathing

• Exhaust sound

Using precision-machined components allows the geometry to remain highly consistent between header sets.

.065-INCH T304L STAINLESS CONSTRUCTION:

The header runners are manufactured from mandrel-bent:

.065-inch-wall T304L stainless steel

This construction is intended to balance:

• Strength

• Heat resistance

• Exhaust durability

• Long-term corrosion resistance

• Fabrication consistency

The headers are back-purged during TIG welding to protect the inside of the welds and promote proper penetration.

BUILT FOR TRACK USE:

SOUL specifically emphasizes durability in demanding environments.

The headers use:

• Billet stainless head flanges

• Billet stainless merge collectors

• Thick-wall stainless tubing

• Back-purged TIG welding

• Heavy-duty fabrication fixtures

SOUL's thick-gauge aluminum fixtures also act as heat sinks during fabrication, helping prevent warpage while maintaining consistent alignment.

This construction is intended to withstand repeated hard use and aggressive heat cycling.

SOUND CHARACTER:

Replacing the restrictive factory header assemblies allows more of the GT engine's natural exhaust character to reach the remainder of the exhaust system.

Expect:

• Greater flat-six presence

• Sharper throttle-related sound

• Increased mechanical character

• Stronger midrange exhaust tone

• Greater high-RPM intensity

• More pronounced naturally aspirated wail approaching redline

• Amplification of the characteristics of the downstream exhaust system

The final volume will depend heavily on whether the vehicle retains its factory center muffler and side mufflers or uses additional aftermarket exhaust components.

WITH FACTORY REAR EXHAUST:

The Street Headers can be used while retaining the factory Porsche rear exhaust system.

This configuration provides:

• Improved upstream exhaust flow

• Performance catalytic converters

• Increased throttle response

• Stronger engine character

• Retention of the original Porsche rear mufflers

• Retention of factory exhaust-valve functionality

This makes the Street Headers a logical first-stage exhaust upgrade for customers who want improved performance without immediately replacing every downstream exhaust component.

WITH SOUL CENTER MUFFLER BYPASS:

Pairing the Street Headers with SOUL's Center Muffler Bypass produces a considerably more aggressive configuration.

This combination retains:

• Catted headers

• Factory side mufflers

• Factory exhaust valves

while replacing the large factory center muffler.

Expect significantly more naturally aspirated sound while still retaining useful factory valve control.

WITH SOUL SIDE MUFFLER UPGRADES:

Further changes to the side mufflers can dramatically increase overall sound.

The Street Headers amplify whichever exhaust configuration is installed behind them, so customers should consider the complete system when selecting how aggressive they want the vehicle to become.

A car with Street Headers and otherwise factory exhaust will behave very differently from one using Street Headers plus center- and side-muffler bypass components.

STREET HEADERS VS. COMPETITION HEADERS:

Street Headers

• $6,495.00

• Retain performance catalytic converters

• More street-oriented configuration

• Increased exhaust flow

• Increased throttle response

• Greater naturally aspirated sound

• Billet CNC-machined flanges and collectors

• Suitable for aggressive street and track use

Competition Headers

• Completely catless

• Maximum available header flow

• Greater exhaust sound

• Lower purchase price

• Greater emissions and diagnostic considerations

• More competition-focused configuration

The Street Headers are the appropriate choice for customers seeking a freer-flowing header system while retaining catalytic converters.

PERFORMANCE:

SOUL describes the Street Headers as providing gains in:

• Power

• Throttle response

• Exhaust flow

• Exhaust tone

However, the current manufacturer product page does not publish a standalone horsepower or torque figure for this header set.

DasMotoring therefore does not advertise a specific numerical power increase.

WEIGHT:

SOUL does not currently publish verified factory and aftermarket weights for the 991 GT3 Street Headers.

No specific weight-savings figure should therefore be assumed.

ECU CALIBRATION / CHECK ENGINE LIGHT:

The current SOUL product page does not specify that ECU calibration is required for installation.

It also does not provide an unconditional no-CEL guarantee.

Because the factory catalyst assemblies are replaced with aftermarket performance catalytic converters, diagnostic behavior can depend on vehicle specification, calibration, catalyst condition, oxygen-sensor condition, and other modifications.

DasMotoring therefore does not advertise either a guaranteed no-CEL condition or a mandatory tuning requirement for this product.

EMISSIONS NOTE:

The SOUL Street Headers retain catalytic converters but replace the vehicle's original Porsche emissions-related exhaust assemblies with aftermarket performance components.

They are not CARB certified.

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