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Here's my setup: Stage 1 from Genuine Saab, TD04 swap done & Viggen intercooler. Today while trying to boost I heard a bunch of air escaping. My bypass valve broke (I only replaced it less than 2 years ago with a thesaabsite upgraded unit). I know stage 1 was good for about 18-20psi (says the boost gauge I had prior to installing the TD04).

Anyway, I ordered the dual piston blow off valve from Genuine Saab, and my question is: what color spring do I need to run?
 

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Typically green is the best one to run till you start making 300+hp. Even then some say green is still good.
 

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I run a blue spring with 3 shims. It holds 30lb and still vents 5lb of boost.

I recommend you run a blue spring, no shims.
 
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