Description

*SPEC-L II weight: 10.0kg (60% less than the original muffler)

The HKS Hi-Power SPEC-L II represents a purpose-engineered, weight-optimized exhaust system designed specifically for the Honda S2000 AP2 chassis (2005-2009), delivering significant mass reduction alongside refined performance gains and controlled acoustic enhancement.

Engineered with a remarkable 40% weight reduction compared to the factory exhaust—achieving just 10.0kg total system weight—this system directly improves the S2000’s power-to-weight ratio and chassis responsiveness while maintaining near-stock sound levels (94 dB proximity measurement vs. factory 95 dB).

Through its precision S304 stainless steel construction, optimized Y-pipe design, and Hi-Power muffler configuration, the SPEC-L II provides a balanced performance solution that prioritizes driving dynamics and engineering purity over excessive volume or aggressive styling.

Product Highlights

⚖️ Dramatic Weight Reduction for Enhanced Dynamics
Achieving a substantial 40% reduction in overall exhaust system weight—with a total mass of just 10.0kg compared to the significantly heavier factory unit. Consequently, the SPEC-L II directly improves the S2000’s power-to-weight ratio and chassis responsiveness.

This reduction in unsprung and rear-biased mass enhances turn-in characteristics. It also improves mid-corner balance and acceleration response. All while adhering to the S2000’s engineering philosophy of minimal mass and optimal balance.

🔇 Controlled Acoustic Enhancement with Near-Stock Decibel Levels
Engineered to deliver a refined performance sound without excessive volume, the SPEC-L II produces a measured 94 dB during proximity testing—just 1 dB below the factory system’s 95 dB measurement.

This intelligent acoustic tuning provides a more purposeful exhaust note during spirited driving, while maintaining excellent street manners and track-day noise compliance. This demonstrates that performance enhancement need not correlate with increased decibel output.

🔧 Precision S304 Stainless Steel Construction & Y-Pipe Optimization
Utilizing premium S304 stainless steel throughout its mandrel-bent construction. This system ensures long-term durability and corrosion resistance. Moreover, the specifically engineered Y-pipe design optimizes exhaust gas scavenging and flow characteristics.

The dual 60-50mm intermediate piping (representing the widest flow sections) maintains optimal exhaust velocity while reducing backpressure compared to the factory configuration.

📐 Practical Ground Clearance for Real-World Usability
With a measured 135mm of ground clearance at the exhaust system’s lowest point (on standard suspension), the SPEC-L II maintains excellent real-world usability while accommodating mild lowering modifications. This practical design consideration ensures the performance benefits remain accessible for daily-driven and weekend-use S2000s. Importantly, the benefits are not restricted to perfectly smooth surfaces or track-only applications.

Technical Specifications

Product Name: Hi-Power SPEC-L II

Model Code: 32016-AH128

Certification Number: 03S16857

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

Construction & Materials:

• Primary Material: S304 stainless steel

• Muffler Configuration: Hi-Power SPEC-L II design

• Tailpipe Diameter: 94mm left and right

• Intermediate Piping: Dual 60-50mm configuration (widest flow sections)

• Application Area: Y-pipe and complete cat-back system

Performance & Dimensions:

• Weight: 10.0kg total system weight (40% reduction from factory)

• Proximity Exhaust Sound: HKS: 94 dB | Factory: 95 dB

• Ground Clearance: 135mm at lowest exhaust point (standard suspension reference)

Installation & Fitment Notes:

• Mounting Components: Hooks, brackets, and stays subject to revision without notice

• Suspension Compatibility: Primary data from standard suspension with some testing on lowering springs and height-adjustable kits

• Clearance Consideration: Minimum ground clearance measured specifically at exhaust components, which may differ from overall vehicle clearance

Performance & Engineering Philosophy

Goal: To deliver meaningful performance enhancement through significant weight reduction and optimized flow characteristics while maintaining refined acoustics and practical usability—creating a comprehensive exhaust solution that aligns with the S2000’s engineering ethos of balance, precision, and driver engagement.

Focus: Mass reduction for improved power-to-weight ratio and chassis dynamics; flow optimization through specifically engineered Y-pipe design; controlled acoustic enhancement that complements rather than overwhelms the driving experience; and practical implementation ensuring real-world usability across diverse driving conditions.

Installation & Application Considerations

🔧 Professional Installation Recommended
While designed for direct replacement, proper installation requires careful alignment to ensure optimal ground clearance, proper sealing at connection points, and correct mounting to prevent stress on exhaust hangers given the system’s reduced mass and different weight distribution compared to factory.

⚠️ Critical Fitment & Usage Notes:

• Weight Distribution Impact: The significant rear mass reduction may subtly alter chassis balance characteristics, potentially requiring suspension tuning adjustments for competitive applications

• Ground Clearance Context: The 135mm measurement represents the exhaust system specifically; overall vehicle clearance may differ with suspension modifications or driving conditions

• Component Evolution: Mounting hardware including hooks, brackets, and stays may be revised as part of continuous product improvement

• Sound Characteristics: While proximity measurements show minimal decibel increase, the exhaust note’s quality and character differ meaningfully from factory, particularly in mid-to-high RPM ranges

🎯 Primary Performance & Experience Benefits:

• Chassis Response Improvement: Significant weight reduction enhances turn-in response, transitional agility, and acceleration characteristics

• Flow Optimization: Engineered Y-pipe design improves exhaust scavenging for potential power gains, particularly in mid-to-high RPM ranges

• Acoustic Refinement: Purposeful exhaust note that communicates engine load and RPM without excessive volume or drone

• Quality & Durability: S304 stainless steel construction ensures long-term performance consistency and corrosion resistance

Strategic Advantages & Design Rationale

📉 Weight-Focused Performance Approach
By prioritizing mass reduction over extreme flow capacity or aggressive acoustics, the SPEC-L II addresses a fundamental performance parameter often overlooked in exhaust design—directly improving acceleration, braking, and handling through significant weight savings rather than solely pursuing peak power gains.

⚖️ Balanced Enhancement Philosophy
The combination of near-stock sound levels with substantial weight reduction demonstrates a sophisticated approach to performance enhancement that respects the S2000’s refined character while delivering measurable improvements in driving dynamics—appealing to enthusiasts who value balanced progress over singular focus on power or sound.

🔬 Empirical Rather Than Aesthetic Design
With certified sound measurements, precise weight specifications, and documented clearance data. This system provides transparent performance parameters rather than relying on subjective claims. Therefore, informed decisions can be made based on engineering data rather than marketing generalizations.