HKS 33005-AT007 Super Manifold GT-Spec Stainless Steel Header with Catalyzer

The HKS Super Manifold GT-Spec is a high-performance exhaust header system engineered to maximize engine output across the entire RPM range. This stainless steel header features a combined manifold and catalytic converter unit designed to deliver both street drivability and enhanced high-RPM performance. The system retains the stock front pipe for straightforward installation.

Key Features:

• Combined manifold and primary catalytic converter unit for optimized exhaust flow
• 4-2-1 straight junction design for balanced torque and horsepower gains
• Bypass pipe technology to control exhaust pressure and vacuum cycles
• Stainless steel construction for durability and corrosion resistance
• Retains stock front pipe for simplified installation
• Engineered for flat torque curve and improved drivability

Advanced Engineering:

HKS developed this header using advanced exhaust gas dynamics to achieve inertia exhaust efficiency. The strategic bypass pipe placement reduces backpressure without sacrificing low-end torque, while the 4-2-1 collector design accelerates exhaust gases using pressure differentials. This straight junction configuration pulls combustion gases more efficiently than traditional designs, resulting in improved volumetric efficiency throughout the power band.

Unlike aggressive 4-1 competition headers that sacrifice low-RPM performance, the GT-Spec maintains excellent street manners while delivering significant top-end gains. The integrated catalytic converter ensures emissions compliance while minimizing restriction.