Quote:
Originally Posted by SmsAlSuwaidi
decisions decisions, i might buy a 10 psi spring and keep it if necessary. I have a feeling 10 psi with a gtx30 on 91 pump would not be ideal 
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You are thinking about it wrong.. The bigger the turbo, the more efficient and cold the 10 psi will be, thus safer from knocking. (Obviously not large to infinity, but large and still within the compressor map)
What WG you have? Tial ones come with all the springs necessary to change PSI.