Cobb Tuning 2008 WRX Lowering Springs [COB 914750] In an effort to induce a more balanced feel, the Spring Rates are approximately +10% for the front and +20% for the rear over stock. The result is a sporty feel without being unnecessarily harsh or bouncy. Our final spring rates are the result of extensive real-world and road course testing. Made from precision CNC cold wound high quality Chrome Silicon steel construction and powdercoated COBB Blue in a unique process for protection against the elements.