Description

The HKS Extension Kit provides specialized exhaust system components originally developed for the GT570 and GT600 racing packages. These components are now offered separately for competition-focused builders. These straight catalyst-type extensions deliver critical exhaust system geometry optimization for time attack and circuit racing applications.

In these environments, exhaust flow efficiency takes absolute precedence over emissions compliance. By offering these competition-proven components individually, HKS enables targeted upgrades for specific racing objectives. Builders can achieve this without requiring complete exhaust system replacement.

Product Highlights

🏁 Competition-Proven Design from Racing Packages
Originally developed and refined as standard equipment in HKS’s GT570 and GT600 racing systems, these extensions benefit from extensive track testing. They also benefit from competition validation. Consequently, they represent proven solutions for optimizing exhaust flow. This is important in high-performance racing environments where every horsepower matters.

⚡ Straight Catalyst-Type Design for Maximum Flow Efficiency
Utilizing a straight-through design that eliminates catalytic restrictions, these extensions prioritize unrestricted exhaust gas evacuation above all other considerations. Therefore, they significantly reduce backpressure compared to standard catalytic converters. The design facilitates improved turbo spool response and top-end power delivery.

🎯 Time Attack and Circuit Racing Optimization
Specifically engineered for vehicles competing in time attack events and circuit racing, these extensions address the unique demands of sustained high-load operation. Their design considers factors such as heat management under repeated full-throttle application. It also addresses the acoustic requirements of controlled racing environments.

🔧 Targeted Upgrade for Specific Performance Objectives
By making these extensions available separately from complete exhaust systems, HKS enables builders to address specific bottlenecks in their existing setups. This approach allows for strategic, cost-effective upgrades that target exact performance limitations. Builders can achieve this without unnecessary system redundancy.

Technical Specifications

Product Name: Extension Kit

Model Code: 14018-AN004

Compatibility: Nissan GT-R R35 (VR38DETT, 07/2007 onwards). Designed exclusively for competition applications.

Configuration: Straight catalyst-type design (non-catalytic function)

Kit Composition:

• Extensions: One left bank extension, one right bank extension

• Material: High-quality construction suitable for extreme thermal environments

• Connection: Designed for integration with HKS racing exhaust systems and compatible aftermarket setups

Critical Usage Classification:

• Competition Only: Lacks catalytic function and therefore cannot be used on public roads

• Racing Application: Specifically intended for time attack, circuit racing, and other sanctioned competition environments

• Made-to-Order: Produced according to specific racing requirements and performance objectives

Performance & Application Philosophy

Goal: To provide targeted exhaust system optimization for competition vehicles, reducing backpressure and improving exhaust flow efficiency specifically for racing applications where emissions compliance is not a consideration.

Focus: Maximum flow efficiency for sustained high-load operation, integration with existing racing exhaust systems, and strategic upgrade potential for vehicles already equipped with performance exhaust components.

Installation & System Integration

🔧 Professional Installation Recommended
Proper installation requires precise alignment and secure connection to prevent exhaust leaks that could compromise performance or pose safety risks in racing environments.

⚠️ Critical Usage Restrictions:

• Competition Classification: Absolutely not suitable for street use due to lack of catalytic function

• Legal Compliance: Removal of catalytic converters violates emissions regulations in virtually all jurisdictions

• Intended Environment: Designed exclusively for closed-course competition where emissions controls are not required

🎯 Primary Application Scenarios:

• Time Attack Vehicles: Where consistent lap times depend on optimal power delivery throughout extended sessions

• Circuit Racing Cars: That require sustained high-load performance without catalytic heat retention concerns

• Drag Competition Vehicles: Benefiting from reduced exhaust restriction during maximum acceleration runs

• Race-Tuned Track Cars: Operating in environments where emissions compliance is not monitored or required

Strategic Benefits & Performance Rationale

🌪️ Reduced Exhaust Backpressure for Improved Response
The straight-through design minimizes exhaust gas restriction, allowing turbos to spool more quickly. Additionally, it reduces pumping losses at high RPM. This translates directly to improved throttle response and power delivery throughout the usable power band.

🔥 Enhanced Thermal Management for Sustained Performance
Without catalytic converters to retain and radiate heat, these extensions help maintain lower exhaust gas temperatures during extended high-load operation. Consequently, this reduces thermal stress on surrounding components and helps maintain consistent performance throughout racing sessions.

🔄 Strategic Upgrade Path for Existing Racing Systems
For vehicles already equipped with performance exhaust components but retaining catalytic restrictions, these extensions provide a focused upgrade. This upgrade specifically addresses the most significant flow bottleneck without requiring complete system replacement.

📈 Proven Integration with HKS Racing Ecosystem
As original equipment in the GT570 and GT600 packages, these extensions are known to work optimally with HKS’s complete racing systems, including turbo kits, intercoolers, and engine management solutions.