PERRIN took their classic WRX pulley and modified the rear belt keeper to make for easier installation on the new 08+ WRX and STI. For those who have not seen these, there is no AC belt tensioner anymore and you need to stretch fit the belt onto the crank pulley. This was made even more difficult with the older design.
Weight reduction is key to making the best use of any available HP and torque. In no place on our vehicle is this more important than the rotating mass found in the engine. The PERRIN Performance Crank Pulley is 4-pounds lighter than the stock crank pulley. This reduction is equal to removing more than 100 lbs of vehicle weight! Throttle response, horsepower and torque are all increased with this easy to install product! The PERRIN crank pulley is cut from 6061T6 aluminum, anodized black and laser etched for increased belt life and a precision fit.
About Manufacturer: Perrin
The ALTA Performance Group™ has been a pioneer and market leader in the performance aftermarket since our inception more than 10 years ago. Using the finest materials and labor, found here in the United States, you are assured that PERRIN™ stands for quality and value. Our customer service, sales and technical staff is always available to help you with questions or concerns. From live instant chat messaging on the website, to e-mail or phone, we pride ourselves on the unique levels of customer service we provide that are simply not found elsewhere in the aftermarket today.