Description

The HKS SUPER MANIFOLD with CATALYZER GT-SPEC is a revolutionary, high-performance exhaust manifold that integrates a high-efficiency metal catalyst into an optimized 4-2-1 equal-length header design. Engineered specifically for the FA24 engine, it replaces the restrictive factory ceramic catalyst with a low-density metallic unit, dramatically reducing exhaust backpressure while maintaining full compliance with 2018+ emissions regulations (third-party certified). Combined with its precisely tuned isometric runner layout, this manifold delivers substantial gains across the powerband, with peak improvements of +10.2 kW (+13.9 PS) and +22.5 Nm—most notably transforming mid-range torque response.

Product Highlights

⚡ High-Efficiency Metal Catalyst for Minimal Restriction
Replaces the factory fine-mesh ceramic catalyst with a low-density, high-flow metal catalyst. This critical change significantly reduces exhaust backpressure—the primary restriction in the factory system—while maintaining effective emissions control, certified to meet 2018 exhaust gas standards.

🔧 Precision 4-2-1 Equal-Length Runner Layout
Features a meticulously engineered 4-2-1 equal-length primary and secondary runner configuration. This design optimizes exhaust gas scavenging, improves cylinder filling, and enhances volumetric efficiency, resulting in broader, more responsive power delivery, especially in the critical mid-range.

📈 Substantial, Verified Power & Torque Gains

• Peak Gain: +10.2 kW (+13.9 PS) and +22.5 Nm at 4300 RPM—an approximate 11% improvement over stock.

• Mid-Range Transformation: Drastically reduces the torque dip around 4000 RPM, filling in the powerband for smoother, stronger acceleration.

• Full-Range Improvement: When paired with an HKS performance muffler (e.g., Hi-Power SPEC-L II), power is increased across the entire rev range.

🏗️ Optimized Flange & Flow Path Design
The head-side flange has been redesigned to minimize the step at the pipe insertion point, creating a smoother transition from the exhaust port and further improving flow efficiency compared to the factory manifold.

⚠️ Advanced, Integrated Design
This is a manifold-integrated front pipe (manifold + primary catalyst in one unit). It replaces the stock manifold and front pipe assembly, requiring more involved installation but offering a holistic solution for exhaust flow.

Technical Specifications

• Product Name: SUPER MANIFOLD with CATALYZER GT-SPEC

• Model Code: 33005-AT010

• Compatibility: Toyota GR86 / Subaru BRZ (ZN8/ZD8, FA24 engine, 2021+)

• Configuration: 4-2-1 Equal Length, Integrated Metal Catalyst

• Pipe Diameter: Φ42.7mm (Primary) → Φ50.8mm (Secondary) → Φ60mm (Collector)

• Catalyst Type: High-flow Metal Substrate (Emissions Compliant)

• Material: Performance Steel

• Fitment: Compatible with Applied AE type models.

Performance Data (Combined with HKS Hi-Power SPEC-L II Muffler)

Key Takeaway: The HKS manifold shifts the torque peak higher and significantly amplifies output in the 4000-5000 RPM range, effectively eliminating the stock torque dip.

Installation & Critical Notes

🔧 Professional Installation Mandatory
Installation requires removal of the stock manifold and front pipe assembly. It involves working near the engine block, dealing with exhaust gaskets, and precise fitment. Must be installed by a professional mechanic or performance shop.

⚙️ Tuning Consideration
While this part can be used without an ECU tune and will provide gains, maximum benefit and safe long-term operation are achieved with a proper ECU tune to account for the significantly altered exhaust flow and air/fuel ratios.

✅ Emissions & Compliance
This manifold is third-party certified to comply with 2018 Japanese exhaust gas regulations. Verify its legality for road use and emissions testing in your local region.

CATALYZER GT-SPEC