HKS GR Supra B58 Front Pipe w/ Metal Catalyzer

The HKS Front Pipe with Metal Catalyzer is a high-performance exhaust upgrade designed specifically for the Toyota GR Supra equipped with the B58 engine. This unit replaces the factory front pipe and catalytic converter, significantly improving exhaust flow while retaining a high-quality metal catalyst.

Engineered with HKS’s motorsports expertise, the integrated metal catalyzer features approximately 150 catalyst cells compared to the factory unit’s roughly 600 cells. This reduction in cell density lowers exhaust back-pressure, resulting in improved throttle response and increased engine output. HKS testing reports power gains of approximately +13 PS with this upgrade alone.

Constructed from durable SUS304 stainless steel, the front pipe offers excellent heat resistance, corrosion protection, and long-term reliability. The large-diameter piping (approximately 85 mm) further enhances exhaust efficiency and pairs well with both stock and aftermarket exhaust systems. Sound levels increase slightly compared to stock, delivering a sportier exhaust note without excessive harshness.

The HKS metal catalyzer is designed to meet modern emissions standards in many markets, using an optimized precious metal formulation and WLTC testing. However, it is not CARB-certified and may not be legal for use in California or regions with strict emissions regulations.