The factory headers on the naturally aspirated Porsche 718 4.0L combine restrictive primary tubing, conventional collectors, and large catalytic converters that limit exhaust flow and suppress much of the engine's natural character. SOUL Competition Headers replace the complete factory header and catalyst assemblies with a purpose-built, catless performance design engineered to improve exhaust flow, reduce weight, sharpen engine response, and substantially increase the intensity of the 4.0L flat-six exhaust note.
SOUL developed these headers around smoother transitions from the cylinder head into the primary tubes, large-radius mandrel bends, and performance-oriented collectors with merge spikes. The result is a less restrictive exhaust path designed to improve scavenging and flow while allowing substantially more sound through the remainder of the exhaust system.
Removing the factory catalytic converters also reduces weight and heat concentrated around the engine and exhaust system. The complete SOUL Competition Header assemblies weigh approximately 18.45 lbs, compared with approximately 25.7 lbs for the factory components—a savings of approximately 7.25 lbs.
DETAILS:
Fits Porsche 718 Cayman GT4, 718 Spyder, Cayman GTS 4.0, and Boxster GTS 4.0 models (2020+), excluding GT4 Clubsport models
Complete catless replacement for the factory header and catalytic converter assemblies
Direct bolt-on installation
Performance-oriented collectors with merge spikes improve the transition from the primary tubes into the exhaust system
Smooth-radius, large-diameter primary tubing designed to improve exhaust flow and engine response
Weighs approximately 18.45 lbs / 8.4 kg compared with approximately 25.7 lbs / 11.7 kg for the factory components
Saves approximately 7.25 lbs / 3.2 kg versus the factory header assemblies
Constructed from mandrel-bent .065-inch-wall T304L stainless steel tubing
Cast cylinder-head flanges provide a smooth transition from the exhaust ports into the primary runners
Back-purged TIG welded for strength, weld penetration, and long-term durability
Precision water-jet-cut exhaust flanges manufactured to tolerances of approximately ±0.003 inch
Fabricated in dedicated fixtures designed to control heat during welding and maintain precise fitment
Includes new high-grade installation hardware and OEM-style three-bolt gaskets
Backed by SOUL Performance Products' Lifetime Warranty for both street and track use
Designed and manufactured in-house at SOUL Performance Products in Willow Grove, Pennsylvania
IMPORTANT: These headers remove the factory catalytic converters and will likely trigger a check engine light without appropriate ECU calibration. SOUL also notes that catalyst removal on 4.0L 718 models may cause a slight idle surge under certain operating conditions due to factory ECU emissions logic. This behavior can be addressed through ECU tuning.
FOR CLOSED-COURSE COMPETITION USE ONLY: This product is not CARB certified and may not be legal for use on emissions-controlled vehicles. Customers are responsible for ensuring compliance with applicable local, state, and federal regulations.
STREET VS. COMPETITION HEADERS: SOUL Street Headers retain catalytic converters and are intended for owners looking for increased flow, response, and exhaust character while maintaining a more street-friendly configuration. SOUL Competition Headers eliminate the catalytic converters entirely for maximum exhaust flow, weight reduction, and sound.
The factory headers on the naturally aspirated Porsche 718 4.0L combine restrictive primary tubing, conventional collectors, and large catalytic converters that limit exhaust flow and suppress much of the engine's natural character. SOUL Competition Headers replace the complete factory header and catalyst assemblies with a purpose-built, catless performance design engineered to improve exhaust flow, reduce weight, sharpen engine response, and substantially increase the intensity of the 4.0L flat-six exhaust note.
SOUL developed these headers around smoother transitions from the cylinder head into the primary tubes, large-radius mandrel bends, and performance-oriented collectors with merge spikes. The result is a less restrictive exhaust path designed to improve scavenging and flow while allowing substantially more sound through the remainder of the exhaust system.
Removing the factory catalytic converters also reduces weight and heat concentrated around the engine and exhaust system. The complete SOUL Competition Header assemblies weigh approximately 18.45 lbs, compared with approximately 25.7 lbs for the factory components—a savings of approximately 7.25 lbs.
DETAILS:
Fits Porsche 718 Cayman GT4, 718 Spyder, Cayman GTS 4.0, and Boxster GTS 4.0 models (2020+), excluding GT4 Clubsport models
Complete catless replacement for the factory header and catalytic converter assemblies
Direct bolt-on installation
Performance-oriented collectors with merge spikes improve the transition from the primary tubes into the exhaust system
Smooth-radius, large-diameter primary tubing designed to improve exhaust flow and engine response
Weighs approximately 18.45 lbs / 8.4 kg compared with approximately 25.7 lbs / 11.7 kg for the factory components
Saves approximately 7.25 lbs / 3.2 kg versus the factory header assemblies
Constructed from mandrel-bent .065-inch-wall T304L stainless steel tubing
Cast cylinder-head flanges provide a smooth transition from the exhaust ports into the primary runners
Back-purged TIG welded for strength, weld penetration, and long-term durability
Precision water-jet-cut exhaust flanges manufactured to tolerances of approximately ±0.003 inch
Fabricated in dedicated fixtures designed to control heat during welding and maintain precise fitment
Includes new high-grade installation hardware and OEM-style three-bolt gaskets
Backed by SOUL Performance Products' Lifetime Warranty for both street and track use
Designed and manufactured in-house at SOUL Performance Products in Willow Grove, Pennsylvania
IMPORTANT: These headers remove the factory catalytic converters and will likely trigger a check engine light without appropriate ECU calibration. SOUL also notes that catalyst removal on 4.0L 718 models may cause a slight idle surge under certain operating conditions due to factory ECU emissions logic. This behavior can be addressed through ECU tuning.
FOR CLOSED-COURSE COMPETITION USE ONLY: This product is not CARB certified and may not be legal for use on emissions-controlled vehicles. Customers are responsible for ensuring compliance with applicable local, state, and federal regulations.
STREET VS. COMPETITION HEADERS: SOUL Street Headers retain catalytic converters and are intended for owners looking for increased flow, response, and exhaust character while maintaining a more street-friendly configuration. SOUL Competition Headers eliminate the catalytic converters entirely for maximum exhaust flow, weight reduction, and sound.
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