The factory headers on the naturally aspirated Porsche 718 4.0L are engineered around packaging, emissions requirements, and mass-production constraints, leaving significant opportunity to improve exhaust flow and sound. SOUL Street Headers replace the factory header assemblies with a purpose-built performance design featuring larger, freer-flowing catalytic converters, optimized runners, and improved collectors to increase flow, sharpen engine response, and bring out more of the 4.0L flat-six exhaust note.
Unlike SOUL Competition Headers, the Street Headers retain catalytic converters, making them the more refined choice for owners who want improved exhaust performance and sound without moving to a fully catless configuration. SOUL uses smoother transitions from the cylinder head into the primary runners, large-radius bends, and performance-oriented collectors with merge spikes to improve the exhaust path through the complete header assembly.
The SOUL Street Headers weigh approximately 24.19 lbs, compared with approximately 25.7 lbs for the factory components. While the weight reduction is modest, the primary benefit of this system is the improved exhaust geometry and reduced restriction provided by the redesigned runners, collectors, and catalytic converter assemblies.
DETAILS:
Fits Porsche 718 Cayman GT4, 718 Spyder, Cayman GTS 4.0, and Boxster GTS 4.0 models (2020+)
Direct bolt-on replacement for the factory header assemblies
Retains catalytic converters for a more street-oriented configuration than SOUL Competition Headers
Large-diameter, free-flowing catalytic converters designed to reduce exhaust restriction
Optimized cast cylinder-head flanges provide a smoother transition from the exhaust ports into the primary runners
Large-radius primary tubing improves the exhaust path compared with the restrictive geometry of the factory headers
Performance-oriented collectors with merge spikes improve the transition from the individual primary runners into the exhaust system
Designed to improve exhaust flow, throttle response, performance, and flat-six engine tone
Weighs approximately 24.19 lbs / 11.0 kg compared with 25.7 lbs / 11.7 kg for the factory header assemblies
Saves approximately 1.51 lbs / 0.6 kg versus the factory components
Constructed from mandrel-bent .065-inch-wall T304L stainless steel tubing
Back-purged TIG welded for proper weld penetration, durability, and long-term reliability
Precision water-jet-cut exhaust flanges manufactured to approximately ±0.003-inch tolerances
Fabricated in dedicated fixtures designed to minimize distortion during the welding process and maintain accurate 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
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 are engineered around packaging, emissions requirements, and mass-production constraints, leaving significant opportunity to improve exhaust flow and sound. SOUL Street Headers replace the factory header assemblies with a purpose-built performance design featuring larger, freer-flowing catalytic converters, optimized runners, and improved collectors to increase flow, sharpen engine response, and bring out more of the 4.0L flat-six exhaust note.
Unlike SOUL Competition Headers, the Street Headers retain catalytic converters, making them the more refined choice for owners who want improved exhaust performance and sound without moving to a fully catless configuration. SOUL uses smoother transitions from the cylinder head into the primary runners, large-radius bends, and performance-oriented collectors with merge spikes to improve the exhaust path through the complete header assembly.
The SOUL Street Headers weigh approximately 24.19 lbs, compared with approximately 25.7 lbs for the factory components. While the weight reduction is modest, the primary benefit of this system is the improved exhaust geometry and reduced restriction provided by the redesigned runners, collectors, and catalytic converter assemblies.
DETAILS:
Fits Porsche 718 Cayman GT4, 718 Spyder, Cayman GTS 4.0, and Boxster GTS 4.0 models (2020+)
Direct bolt-on replacement for the factory header assemblies
Retains catalytic converters for a more street-oriented configuration than SOUL Competition Headers
Large-diameter, free-flowing catalytic converters designed to reduce exhaust restriction
Optimized cast cylinder-head flanges provide a smoother transition from the exhaust ports into the primary runners
Large-radius primary tubing improves the exhaust path compared with the restrictive geometry of the factory headers
Performance-oriented collectors with merge spikes improve the transition from the individual primary runners into the exhaust system
Designed to improve exhaust flow, throttle response, performance, and flat-six engine tone
Weighs approximately 24.19 lbs / 11.0 kg compared with 25.7 lbs / 11.7 kg for the factory header assemblies
Saves approximately 1.51 lbs / 0.6 kg versus the factory components
Constructed from mandrel-bent .065-inch-wall T304L stainless steel tubing
Back-purged TIG welded for proper weld penetration, durability, and long-term reliability
Precision water-jet-cut exhaust flanges manufactured to approximately ±0.003-inch tolerances
Fabricated in dedicated fixtures designed to minimize distortion during the welding process and maintain accurate 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
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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