I'd say when you replaced the vacc lines you didnt put the restrictor back in the new lines, hence the boost will only go to 9/10 psi. Its a little plastic olive looking thing, if you chucked it, you can buy it as a spare part from Subaru.

See how ya go.

Josh

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Ah! this could be it!! Hrmm anyone have a picture of this blighter? I havent thrown anything away yet so I might still have it.

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Kicking the Tires & Lighting the Fires.

http://www.perth-wrx.com/vb/mechanicals/3819-important-info-anyone-running-7-8psi-standard-boost.html

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www.racewars.com.au

Ah thanks guys it must be the Olive!

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Kicking the Tires & Lighting the Fires.