Description

The HKS Stainless Steel Exhaust Manifold represents a precision-engineered exhaust header system. It is specifically designed to unlock the performance potential of the Honda S2000 AP2’s F22C engine. It achieves this through optimized exhaust gas scavenging and substantial weight reduction. Developed concurrently with the Super Sound Master exhaust and Metal Catalyzer systems, this manifold employs an advanced 4-2-1 layout. It also features HKS's proprietary "twist" enhancement in the secondary piping. This extends effective length to improve mid-range torque while reducing knock susceptibility for greater tuning flexibility.

Weighing a remarkable 4.5kg compared to the factory manifold’s 10.2kg, this system delivers improved power characteristics. Moreover, it also offers meaningful reductions in front-end mass. This contributes to enhanced chassis balance and steering response.

Product Highlights

🔧 Advanced 4-2-1 Layout with Proprietary “Twist” Enhancement
Utilizing the torque-favorable 4-2-1 exhaust configuration as its foundation, HKS engineers have incorporated a distinctive twist in the secondary piping section. This strategically increases effective pipe length.

This innovative modification enhances exhaust gas scavenging efficiency specifically in the mid-range RPM band. The S2000's naturally aspirated engine benefits most from optimized pulse tuning. This process creates a broader and more accessible power band rather than focusing solely on peak horsepower gains.

⚖️ Substantial Weight Reduction for Improved Dynamics
Achieving a dramatic 56% reduction in mass compared to the factory manifold—4.5kg versus 10.2kg—. This stainless steel header significantly decreases front-end weight. As a result, it improves weight distribution and steering response. This mass reduction represents a meaningful enhancement to the S2000’s renowned chassis balance. It complements the power gains with tangible improvements in vehicle dynamics and agility.

🎯 Knock Reduction for Enhanced Tuning Flexibility
By optimizing exhaust gas evacuation and reducing backpressure, this manifold decreases engine knock susceptibility. This allows for more aggressive ignition timing and air-fuel ratio adjustments during tuning. This characteristic proves particularly valuable for naturally aspirated applications. It is critical for performance gains, providing tuners with greater flexibility to safely extract power across the RPM range.

🔗 System Integration with Complementary HKS Components
Designed as part of a cohesive performance ecosystem alongside the Super Sound Master exhaust and Metal Catalyzer systems, this manifold demonstrates synergistic benefits when combined with these complementary components. Testing data reveals that while the manifold alone improves low-to-mid-range performance, the catalytic converter enhances mid-to-high-range power. Together, their combination delivers advantages across the entire RPM spectrum for comprehensive performance enhancement.

Technical Specifications

Product Name: Stainless Steel Exhaust Manifold

Model Code: 33002-AH001

Certification: JASMA certification number 11E001

Vehicle Compatibility: Honda S2000 AP2 (2005-2009, F22C engine)

Design & Construction:

• Layout Configuration: 4-2-1 with HKS proprietary secondary twist enhancement

• Primary Material: Performance-grade stainless steel

• Pipe Diameters: φ45-50-65 (vs. factory φ45-55-65)

• Collector Configuration: Single collector design

• Weight: 4.5kg (56% reduction from factory 10.2kg)

Performance Characteristics:

• Power Band Enhancement: Particularly strong low-to-mid-range torque improvement

• Knock Resistance: Reduced susceptibility allows more aggressive tuning parameters

• Thermal Properties: Optimized for consistent expansion and contraction characteristics

• Flow Efficiency: Enhanced exhaust gas scavenging through pulse tuning optimization

Performance & Engineering Philosophy

Goal: To enhance the S2000’s naturally aspirated power delivery through optimized exhaust gas scavenging while simultaneously improving vehicle dynamics through substantial weight reduction—creating a comprehensive performance improvement that addresses both power production and chassis balance.

Focus: Mid-range torque enhancement through innovative 4-2-1 layout modification; weight reduction for improved front-rear balance and steering response; knock resistance for greater tuning flexibility; and system integration with complementary exhaust components for synergistic performance benefits.

Installation & Application Considerations

🔧 Professional Installation Recommended
Proper installation requires precise alignment, secure fastening with appropriate thermal cycling considerations, and potential tuning adjustments to fully realize the performance benefits. The substantial design differences from factory necessitate careful attention to clearance with surrounding components and proper sealing at connection points.

⚠️ Critical Performance & Integration Notes:

• Tuning Requirements: While providing immediate improvements, maximum benefits require appropriate ignition timing and air-fuel ratio adjustments through professional tuning

• Complementary Systems: Demonstrates synergistic performance when combined with HKS Super Sound Master exhaust and Metal Catalyzer systems

• Thermal Management: May influence underhood temperatures differently than factory manifold; monitoring recommended during initial use

• Emissions Compliance: JASMA certification ensures street legality in Japanese markets; local regulations should be verified for other regions

🎯 Primary Performance Benefits:

• Torque Enhancement: Noticeable improvement in low-to-mid-range power delivery, addressing a common characteristic of high-revving naturally aspirated engines

• Weight Reduction: Significant front mass decrease improves weight distribution and steering response

• Tuning Flexibility: Reduced knock susceptibility allows more aggressive timing and fueling adjustments

• Throttle Response: Enhanced exhaust scavenging improves engine breathing and transient response

Strategic Advantages & Technical Innovation

🔄 Proprietary Twist Enhancement
The innovative secondary pipe twist represents a sophisticated understanding of exhaust pulse tuning. It extends effective length without increasing physical dimensions, thereby improving mid-range torque. This occurs without compromising packaging or requiring excessive space.

📊 Empirical Development Through Comprehensive Testing
The published performance data comparing manifold-only, catalytic converter-only, and combined system benefits demonstrates thorough development methodology rather than theoretical claims, providing realistic expectations for potential performance gains.

⚖️ Dual-Function Performance Enhancement
By addressing both power production through optimized exhaust tuning and vehicle dynamics through substantial weight reduction, this manifold provides comprehensive improvement rather than singular focus. It acknowledges that true performance enhancement involves multiple interconnected systems.

■TEST DATA