The Japspeed Lightweight Aluminium Crankshaft Pulley is designed to improve engine response and efficiency on Subaru Impreza New Age WRX STI models from 2001 to 2007.
Manufactured from high-quality 6061-T6 aluminium, this performance crankshaft pulley reduces rotational mass compared with the standard factory pulley, allowing the engine to rev more freely and respond more quickly to throttle inputs.
By reducing the weight of the rotating assembly, the pulley helps minimise the energy required to accelerate the engine, improving throttle response and power delivery.
The lightweight design also helps reduce parasitic losses, allowing more of the engine's available power to be used for acceleration.
Precision-engineered for strength and durability, the pulley is designed as a direct bolt-on replacement for the original crankshaft pulley, making it a straightforward upgrade for performance-focused vehicles.
Features
Manufactured from high-quality 6061-T6 aluminium
Lightweight construction without compromising strength
Reduces rotational mass compared with the OEM pulley
Designed to improve throttle response
Allows the engine to rev more freely
Helps reduce parasitic power losses
Improves engine response and power delivery
Precision-engineered for strength and durability
Direct bolt-on replacement for the original crankshaft pulley
Suitable for performance and modified vehicles
Vehicle Fitment
Subaru Impreza New Age WRX GDA (2001–2007)
Subaru Impreza New Age STI (2001–2007)
Please Note
We recommend fitting new auxiliary drive belts when installing underdrive pulleys to ensure correct operation and reliability.
