6% Uprated Supercharger Pulley

The Powerhouse 6% uprated supercharger pulley is a performance-focused component engineered specifically for the 4.0L engine in 1997-2003 Jaguar XJR (X308) models. Crafted from high-grade stainless steel, this pulley is CNC machined to meet stringent dimensional tolerances, ensuring a reliable fit that maintains its finish even after repeated heat cycling. Unlike aluminum alternatives, the stainless steel construction helps prevent belt slippage during operation. By altering the pulley ratio, the supercharger spins faster to generate an additional 1.5psi of boost pressure. This pulley is specifically sized to avoid the need for material removal from the supercharger nose, simplifying the installation process compared to more aggressive configurations. Because the factory sensors can detect the increased airflow, no ECU tuning or remapping is required after installation. The kit includes the upgraded pulley and a detailed instruction sheet featuring stage-by-stage photographs to guide the installation. Please note that this specific 6% pulley is designed for these 1997-2003 Jaguar XJR 4.0 models; for those seeking higher boost levels, the manufacturer offers separate 10% pulley options which require different installation procedures regarding supercharger nose clearance.