Running 23psi on stock bov...will hold +28psi boost no problems, thanks mr grub screw

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06 STi: 337hp @23psi on E85...
06 STi: 309hp @22psi on 98ron...

Also running 20+psi on stock. No problems what so ever. Would be a waste of paper IMO. Spend it elsewhere.

I'm pretty sure my stock bpv was actually leaking. When I installed an aftermarket unit (gfb respons) I noticed that I needed a retune to reduce the boost as it was over boosting. Mind you I have a Bugeye so the factory one would have been old. If youre not planning on running very high boost the factory one is probably OK.

All you needed to do was the grub screw mod mate .....


M6 tap and a small grub screw problem solved

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