GReddy SPORT CATALYZER For JB23W Exhaust efficiency superior than Genuine catalyzer Product Features ・ Improves exhaust efficiency by reducing the stock two catalytic converters to one.・ Achieves increased torque across all ranges just by installation, enabling comfortable driving from city streets to highways.・ Especially recommended for automatic transmission vehicles. * Depending on your vehicle’s specifications and driving conditions, the engine check light may illuminate. In such cases, please have a professional shop with specialized knowledge perform ECU settings or other countermeasures. Product Specifications Split, Diameter: 1-piece, 50mm Replace parts : First and Second catalyzer Material: SUS Standard Proximity noise while stationary 82dB (right) / 4875rpm Proximity noise while stationary 84dB