Kiggly Racing Beehive Valve Spring Set | Mitsubishi 4G63 DSM / Evo

High Pressure Beehive Valvesprings 4G63 This thoroughly proven spring set has powered 4g63 vehicles ranging from 6-second drag cars to high-mileage everyday drivers. Introduced in 2006, these were the first beehive valve springs available to the 4g63 platform. They are the best spring set you can use when targeting boost levels up to about 45psi and 11,000rpm. Featuring PAC ovate wire "beehive" springs, designed with s a stress-optimized profile that minimizes spring mass and maximizes natural frequency. This means better stability at high rpm usage. The beehive design also features a variable natural frequency, resulting in better stability during surge points and self-damping. Combining these advanced design features with aerospace quality production and shotpeening results in a high performing, reliable combination. The spring set includes our proprietary titanium retainers and steel seats to achieve an appropriate seat pressure that will prevent excessive wear in long-term street