HKS 33005-AT006 Super Manifold with Catalyzer R-Spec Stainless Steel Header

The HKS 33005-AT006 Super Manifold with Catalyzer R-Spec is a premium stainless steel performance exhaust manifold engineered to maximize power output across the entire RPM range. As the top-tier upgrade over the GT-Spec variant, the R-Spec achieves a substantial reduction in exhaust back pressure by relocating the catalytic converter from the manifold to a redesigned front pipe section — allowing exhaust gases to flow more freely at the manifold itself.

The integrated HKS metal catalyzer in the front pipe maintains emissions functionality while minimizing restriction, delivering strong mid-range pull starting near 3,000 RPM and sustained high-RPM performance. The 4-2-1 collector design is specifically tuned for street and circuit driving, balancing broad torque delivery with top-end horsepower gains. The primary pipes step progressively from Φ42.7mm through Φ50.8mm to a Φ60mm collector for optimized exhaust gas velocity and scavenging efficiency.

Key Features:

• Upgraded R-Spec design — advanced over the Super Manifold GT-Spec
• 4-2-1 collector layout for broad power across street and track RPM ranges
• Catalyzer repositioned to front pipe for reduced manifold back pressure
• HKS metal catalyzer integrated into redesigned front pipe
• Constructed from SUS304 stainless steel for long-term durability under high heat and circuit use
• Stepped pipe sizing: Φ42.7 → Φ50.8 → Φ60mm
• Bolt-on installation — no modification required; includes mounting hardware and gaskets
• Manual transmission only

Built in Japan to HKS's exacting quality standards, this exhaust manifold is a direct-fit bolt-on replacement designed for enthusiasts seeking measurable performance gains without sacrificing streetability or reliability.