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The turbo gauge on Volvo's are notorious for being "non-informative". You should be running around 7-7.5 PSI of boost (can you tell I'm from the colonies? You do the math to convert it to kPa). Where that is on the gauge is anyone's guess, I would suggest getting a good aftermarket gauge w/numbers and mounting it on the A-pillar. If you think the boost is low, you should check all the vacuum lines for leaks and especially the air intake hose between the turbo and the throttle body. Check carefully! There is usually a small amount of oil present inside the hose (leaks out of the turbo seals), over time it degrades the rubber hoses ON THE BOTTOM from the inside out. Devilishly hard to detect unless you actually remove the hose or can get your fingers on the underside of the hose (it will feel very mushy). If you have an intercooler, chack ALL the rubber hoses in the route. This is a very sneaky fault since it starts out barely noticable, especially at low boost but gradually worsens. When it is very bad you can hear a whooshing sound as the air escapes during high boost scenarios. Sounds like a good deal!
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