LEYO Motorsport is offering a wide range of DV/BOV springs to match the correct rates to suit your turbo needs. These WHITE, BLACK and YELLOW springs are designed to suit stock or basic stage 1 - 2 tunes.
 

Stock+Stg1 > Black(10~16 psi)
Stg1 or 1+ > White(16~22 psi)
Stg2 or 2+ > Yellow(22~27 psi)