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hey i have a quick question..going to get the Tial 50mm BOV and notice there are different psi spring specs for them like 7psi/11psi/12psi what does this mean and which should i purchase?
 

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From Tials website:

Select the following spring pressures based on engine vacuum reading:
-10 to -13 in/HG use 7 PSI Spring
-14 to -17 in/HG use 9 PSI Spring
-18 to -21 in/HG use 11 PSI Spring
-22 to -23 in/HG use 12 PSI Spring
 

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Fast Enough, Never Is.
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920 Posts
If your going single and running a lot of boost get the big spring, and if not get the smaller spring. BUT the smaller spring is going to blow off like an SRT4 every time your even thinking about getting close to boost. So thats the difference.
 
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