im using hks at 25psi. its good because it doesnt leak off boost (at least mine doesn't). it also helps if u have a speed density system.

 

Synapse or Tial Q

 

Lol I miss my type s. I loved that sound

Op you should correct your post to 2006 or Evo 9. It's a little confusing. Evo 9 bov is plenty, how high r u going?

 

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Crushed IX diverter holding 28psi all day long over here. Only one I would recommend to anyone running stock turbo.

 

You guys think a non-crushed IX valve would be sufficient for a MAPerformance EF3 turbo? Possibly running 24-25psi?

 

You may leak an insignificant amount at 24-25psi without crushing it, but it should hold just fine at that boost level.

 

I would give it a slight crush

 

Stock Evo 9 is fine for your mods and it will have the best driveability, I'm holding 26lbs no problem