These JDM Pink Springs differ greatly from their USDM counterparts. While the USDM pink springs are closer to Stiffness of the US STi, the JDM pink springs are an upgrade in Stiffness even for an STi! The spring rate of these is 257lbs in the front and 217lbs in the rear. Compared to the WRX factory rate of 163/119, these springs will make a great improvement the Stiffness and response of your car?s handling. In addition to Stiffening up the ride of your car, these springs will also lower it approximately one inch. That one inch lowers your car?s center of gravity just enough to improve handling, but not too much where your car will start to scrape on speed bumps and driveways.