different bov springs???

[n1cK]

where abouts can you find different bov springs ? such as 9 psi 19 psi etc etc

[bodybodyrock]

urmmm, u mean waste gate springs??

[n1cK]

umm no dont think so my mate has got a tial 50mm bov and he changed the spring and now makes a different noise actually sounds better just wondering where can you get these springs from??