Manifold / Headers

SOUL Long Tube Street Headers.

The SOUL Performance Long Tube Street Headers are premium aftermarket performance exhaust manifolds developed specifically for Porsche 987.1 Boxster and Cayman models manufactured between 2005 and 2008.

Fits:

• Porsche Boxster 987 2.7L 2005-08/08
• Porsche Boxster 987 S 3.2/3.4L 2005-08/08
• Porsche Cayman 2.7L 987C 2006-08
• Porsche Cayman S 3.4L 987C 2005-08  

Designed for Porsche's naturally aspirated flat-six engines, these headers replace the original exhaust manifold and primary catalytic converter assemblies with a stainless steel long-tube design incorporating HJS 200-cell high-flow catalytic converters.

The factory Porsche exhaust system is engineered to balance engine performance, emissions requirements, manufacturing costs and everyday driving refinement.

SOUL Performance developed its Long Tube Street Headers to improve the efficiency of the exhaust gas path while retaining catalytic exhaust treatment.

Each header incorporates 1.75-inch primary runners, carefully developed collector geometry and merge spikes designed to create a smoother transition as exhaust gases combine.

The long-tube construction is engineered to improve exhaust scavenging and support more efficient engine breathing.

By improving the movement of exhaust gases away from the cylinder heads, the headers are intended to enhance throttle response, support engine performance and produce a more distinctive naturally aspirated flat-six soundtrack.

The system is manufactured from T304L stainless steel, offering corrosion resistance and durability under demanding exhaust temperatures.

Precision waterjet-cut mounting flanges provide accurate attachment to the cylinder heads, while the internal collector design helps minimise unnecessary turbulence.

A distinguishing feature of these headers is the use of HJS 200-cell high-flow catalytic converters.

These catalysts are designed to combine effective exhaust gas treatment with reduced flow restriction.

HJS uses a double-foil wound catalyst substrate construction intended to improve strength and durability under repeated thermal cycling.

SOUL states that these converters are capable of meeting Euro 3 emissions performance requirements and are designed to reduce the likelihood of triggering a catalyst-related engine warning light.

However, this manufacturer statement should not be interpreted as proof that the complete exhaust modification is certified or road legal for every vehicle and jurisdiction.

Each header set is manufactured and quality-checked at SOUL Performance's Willow Grove, Pennsylvania facility.

The assemblies are tested in a precision fixture to maintain fitment accuracy and prevent fabrication distortion.

The headers are designed as a direct bolt-on replacement for the corresponding factory components, with new high-grade hardware supplied for the header-to-exhaust flange connections.

Backed by SOUL Performance's lifetime warranty, subject to the manufacturer's conditions, these headers provide a performance-focused upgrade for Porsche owners seeking improved exhaust flow, sharper throttle response and a more engaging engine sound.

What This Product Does:
Exhaust headers collect spent combustion gases from the engine's cylinder heads and direct them into the downstream exhaust system.

The Porsche 987.1 Boxster and Cayman use naturally aspirated flat-six engines in which exhaust runner length, diameter and collector geometry can influence engine breathing and power delivery.

The SOUL Performance Long Tube Street Headers provide an alternative exhaust gas path using longer runners, optimised collectors and high-flow catalytic converters.

Their main functions include:

• Collecting exhaust gases: Direct gases away from the engine's cylinder heads.
• Improving exhaust flow: Provide smoother and more efficient gas passages.
• Supporting exhaust scavenging: Use long primary runners and collector geometry to encourage efficient exhaust pulse movement.
• Enhancing throttle response: Help the engine respond more effectively during acceleration.
• Supporting engine performance: Reduce unnecessary exhaust restriction.
• Improving exhaust pulse transition: Use merge spikes within the collectors to smooth gas flow.
• Retaining catalytic treatment: Incorporate HJS high-flow catalytic converters.
• Reducing catalyst restriction: Use 200-cell catalyst substrates designed for efficient gas movement.
• Enhancing exhaust sound: Produce a richer and more pronounced flat-six tone.
• Supporting high-temperature durability: Use T304L stainless steel construction.
• Maintaining downstream exhaust connections: Attach to compatible factory or aftermarket rear exhaust components.
• Preserving fitment accuracy: Use precision-cut flanges and fixture-tested construction.

Why Upgrading Matters:
1. Improved Exhaust Gas Flow

The long-tube runners and optimised collectors are designed to provide a smoother route for exhaust gases leaving the engine.

This helps reduce unnecessary restriction and supports efficient engine breathing.

2. Enhanced Throttle Response

Improved exhaust flow and scavenging can support more responsive engine behaviour.

Drivers may notice a more immediate engine response during acceleration, depending on the overall vehicle configuration.

3. Increased Performance Potential

SOUL Performance developed the header runner dimensions and collectors to help extract additional performance from the 987.1 flat-six engines.

The manufacturer specifically highlights benefits for the 3.4L engine and improvements for the 2.7L engine.

Specific horsepower or torque increases have not been established from the official product specification for every engine variant. No numerical gain should be guaranteed without appropriate dynamometer testing.

4. Enhanced Flat-Six Exhaust Sound

The header design changes the movement of exhaust pulses through the system.

This can produce a fuller, richer and more sporting engine note.

The final sound depends on the original or aftermarket rear exhaust fitted.

5. HJS High-Flow Catalytic Converters

The integrated 200-cell HJS catalysts are designed to retain exhaust gas treatment while reducing restriction.

This is a key distinction from catalyst-free competition headers.

6. High-Quality Stainless Steel Construction

The T304L stainless steel construction offers corrosion resistance and durability in high-temperature exhaust applications.

The components are designed to withstand repeated heating and cooling cycles.

7. Optimised Collector Geometry

SOUL incorporates merge spikes within the collectors to improve exhaust gas transition.

This helps reduce turbulence where the primary runners combine.

8. Precision Mounting Flanges

Waterjet-cut mounting flanges are designed to provide accurate fitment and secure attachment to the cylinder heads.

Correct flange alignment is essential for preventing exhaust leaks.

9. Direct Bolt-On Installation

The headers are developed for the original mounting arrangement of compatible Porsche 987.1 vehicles.

SOUL tests each set in a fitting fixture to maintain dimensional accuracy.

10. Long-Term Durability

The stainless steel construction and HJS catalyst design are intended to provide resistance to corrosion, thermal stress and repeated exhaust temperature changes.

11. Manufacturer Lifetime Warranty

SOUL Performance backs the headers with a lifetime warranty for street and track use, subject to its published warranty conditions.

Related reference numbers
Related, superseded, cross reference or alternative numbers for comparison.

POR.9871.STH

The product you are viewing cross references to these numbers

High performance stud + nut kits for the exhaust manifold to cylinder head for Porsche. Using titanium and Inconel alloy studs, aerospace lock nuts, and a well-thought and balanced combination of metals and plating/coatings, our fasteners will perform better than the traditional fastener. They will never oxidize, and hence will unscrew easily when required.

Novel ultra-high-performance product
• Use of Titanium Ti6Al4V technology
• Extreme perceived quality

Contains 12 x Studs, Nuts & Washers

Fits:
Porsche 911 1965-77
Porsche 964 (none Turbo)
Porsche 993 All
Porsche 996 (none Turbo)
Porsche 997 (none Turbo)
Porsche 986 All
Porsche 987 All
Porsche 718 4 Cyl Turbo

Related reference numbers
Related, superseded, cross reference or alternative numbers for comparison.

SL-Ti-121

The product you are viewing cross references to these numbers