The SOUL Competition Headers are designed for Porsche 981 Cayman GT4, Boxster Spyder, and GT4 Clubsport owners looking to extract maximum performance, response, and sound from the naturally aspirated 3.8L flat-six. By eliminating the factory catalytic converters and replacing the restrictive factory header assemblies with a purpose-built performance design, the Competition Headers create a substantially freer-flowing exhaust path while reducing weight and operating temperatures.
SOUL developed this application specifically around the airflow requirements of the 3.8L engine, using 2-inch primary runners and appropriately sized collectors to maximize exhaust flow throughout the rev range. Port-matched flanges, smooth-radius primary tubing, and performance-oriented collectors work together to improve the transition from the cylinder heads into the remainder of the exhaust system.
Third-party testing performed on a Dyno Dynamics dynamometer demonstrated significant gains when the headers were combined with ECU calibration. SOUL reports approximately 40 wheel horsepower gained with the Competition Headers and tune combined, with approximately 20 wheel horsepower gained from the Competition Headers after the ECU tune had already been applied. Actual results will vary depending on vehicle condition, fuel, calibration, environmental conditions, and supporting modifications.
Removing the factory catalytic converters also produces a significantly more aggressive exhaust note, allowing substantially more of the high-RPM flat-six character of the GT4 and Spyder to come through. For owners prioritizing maximum exhaust flow, performance, and sound, the Competition Headers are the most aggressive header configuration in the SOUL lineup.
Fits 2015–2016 Porsche 981 Cayman GT4, Boxster Spyder, and GT4 Clubsport
Designed specifically around the 3.8L naturally aspirated flat-six
Completely catless replacement for the factory header and catalytic converter assemblies
Features 2-inch primary runners
Properly sized collectors are designed to maximize exhaust flow and performance throughout the rev range
Port-matched flanges provide a smooth transition from the cylinder head into the primary runners
Smooth-radius primary tubing helps minimize unnecessary exhaust restriction
Performance-oriented collectors optimize exhaust flow from the individual primary runners into the remainder of the exhaust system
Designed to improve power, throttle response, engine response, and naturally aspirated flat-six sound
Third-party Dyno Dynamics testing demonstrated approximately 40 whp gained with the Competition Headers and ECU tune combined
Testing demonstrated approximately 20 whp gained from the Competition Headers after the ECU tune had already been applied
Removing the factory catalytic converters reduces weight compared with the factory header assemblies
Catalyst removal also reduces a significant source of heat within the factory exhaust system
Constructed from T304L stainless steel
Direct bolt-on installation
Each header assembly is rigorously quality-checked in-house
Each set is fixture-tested prior to shipment to help ensure accurate fitment
Detailed installation instructions included
Optional O2 sensor spacers available
Backed by SOUL Performance Products' Lifetime Warranty for both street and track use
The SOUL Competition Headers remove the factory catalytic converters and may trigger a check engine light as a result.
Optional O2 sensor spacers are available and may reduce the likelihood of catalyst-efficiency fault codes; however, O2 spacers should not be considered a guaranteed method of preventing a check engine light.
SOUL recommends an appropriate custom ECU calibration to address catalyst-related fault codes on vehicles equipped with these headers. A performance calibration can also allow the engine to better take advantage of the substantially increased exhaust flow provided by the catless configuration.
Optional O2 sensor spacers can be added to the Competition Headers at the time of purchase.
The spacers reposition the downstream oxygen sensors farther from the direct exhaust stream and may reduce the likelihood of catalyst-efficiency fault codes on some vehicles. Results can vary depending on the vehicle and calibration, and DasMotoring does not guarantee that O2 spacers will prevent a check engine light.
The SOUL Competition Headers eliminate the catalytic converters entirely, providing the least restrictive exhaust path, greater exhaust volume, and the most aggressive configuration for the 3.8L engine.
The SOUL Long Tube Street Headers retain large-diameter, free-flowing catalytic converters while still providing substantially improved exhaust flow, response, and performance over the factory header assemblies.
For owners prioritizing maximum flow, sound, and performance—and who plan to appropriately address catalyst-related ECU faults—the Competition Headers provide the more aggressive configuration. For owners who want to retain catalytic converters and maintain a more street-oriented exhaust system, the Long Tube Street Headers provide the catted alternative.
The SOUL Competition Headers remove the factory catalytic converters and are not CARB certified. SOUL identifies this product as intended for off-road use only due to removal of the factory catalytic converters.
Customers are responsible for ensuring compliance with all applicable local, state, and federal regulations before installation or use.
The SOUL Competition Headers are designed for Porsche 981 Cayman GT4, Boxster Spyder, and GT4 Clubsport owners looking to extract maximum performance, response, and sound from the naturally aspirated 3.8L flat-six. By eliminating the factory catalytic converters and replacing the restrictive factory header assemblies with a purpose-built performance design, the Competition Headers create a substantially freer-flowing exhaust path while reducing weight and operating temperatures.
SOUL developed this application specifically around the airflow requirements of the 3.8L engine, using 2-inch primary runners and appropriately sized collectors to maximize exhaust flow throughout the rev range. Port-matched flanges, smooth-radius primary tubing, and performance-oriented collectors work together to improve the transition from the cylinder heads into the remainder of the exhaust system.
Third-party testing performed on a Dyno Dynamics dynamometer demonstrated significant gains when the headers were combined with ECU calibration. SOUL reports approximately 40 wheel horsepower gained with the Competition Headers and tune combined, with approximately 20 wheel horsepower gained from the Competition Headers after the ECU tune had already been applied. Actual results will vary depending on vehicle condition, fuel, calibration, environmental conditions, and supporting modifications.
Removing the factory catalytic converters also produces a significantly more aggressive exhaust note, allowing substantially more of the high-RPM flat-six character of the GT4 and Spyder to come through. For owners prioritizing maximum exhaust flow, performance, and sound, the Competition Headers are the most aggressive header configuration in the SOUL lineup.
Fits 2015–2016 Porsche 981 Cayman GT4, Boxster Spyder, and GT4 Clubsport
Designed specifically around the 3.8L naturally aspirated flat-six
Completely catless replacement for the factory header and catalytic converter assemblies
Features 2-inch primary runners
Properly sized collectors are designed to maximize exhaust flow and performance throughout the rev range
Port-matched flanges provide a smooth transition from the cylinder head into the primary runners
Smooth-radius primary tubing helps minimize unnecessary exhaust restriction
Performance-oriented collectors optimize exhaust flow from the individual primary runners into the remainder of the exhaust system
Designed to improve power, throttle response, engine response, and naturally aspirated flat-six sound
Third-party Dyno Dynamics testing demonstrated approximately 40 whp gained with the Competition Headers and ECU tune combined
Testing demonstrated approximately 20 whp gained from the Competition Headers after the ECU tune had already been applied
Removing the factory catalytic converters reduces weight compared with the factory header assemblies
Catalyst removal also reduces a significant source of heat within the factory exhaust system
Constructed from T304L stainless steel
Direct bolt-on installation
Each header assembly is rigorously quality-checked in-house
Each set is fixture-tested prior to shipment to help ensure accurate fitment
Detailed installation instructions included
Optional O2 sensor spacers available
Backed by SOUL Performance Products' Lifetime Warranty for both street and track use
The SOUL Competition Headers remove the factory catalytic converters and may trigger a check engine light as a result.
Optional O2 sensor spacers are available and may reduce the likelihood of catalyst-efficiency fault codes; however, O2 spacers should not be considered a guaranteed method of preventing a check engine light.
SOUL recommends an appropriate custom ECU calibration to address catalyst-related fault codes on vehicles equipped with these headers. A performance calibration can also allow the engine to better take advantage of the substantially increased exhaust flow provided by the catless configuration.
Optional O2 sensor spacers can be added to the Competition Headers at the time of purchase.
The spacers reposition the downstream oxygen sensors farther from the direct exhaust stream and may reduce the likelihood of catalyst-efficiency fault codes on some vehicles. Results can vary depending on the vehicle and calibration, and DasMotoring does not guarantee that O2 spacers will prevent a check engine light.
The SOUL Competition Headers eliminate the catalytic converters entirely, providing the least restrictive exhaust path, greater exhaust volume, and the most aggressive configuration for the 3.8L engine.
The SOUL Long Tube Street Headers retain large-diameter, free-flowing catalytic converters while still providing substantially improved exhaust flow, response, and performance over the factory header assemblies.
For owners prioritizing maximum flow, sound, and performance—and who plan to appropriately address catalyst-related ECU faults—the Competition Headers provide the more aggressive configuration. For owners who want to retain catalytic converters and maintain a more street-oriented exhaust system, the Long Tube Street Headers provide the catted alternative.
The SOUL Competition Headers remove the factory catalytic converters and are not CARB certified. SOUL identifies this product as intended for off-road use only due to removal of the factory catalytic converters.
Customers are responsible for ensuring compliance with all applicable local, state, and federal regulations before installation or use.
