Checked under the hood again. All hose clamps were fine and piping as well.
Found a loose hose running from under the manifold dangling near the top of the manifold. Found only other possible (visible) place it could of fit to was near the waste gate (a little connector had nothing attached).

Only problem was hose was about 50mm too short to have fitted there?

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96 WRX Wagon
306awhp @ 19 psi