Check the vacume line from the turbo as it could be routed In such a way that it is causing a restriction. A member found this on his xc60 with the d4. I am right in thinking yours is the VEA D4? Any how he sorted the routing and noticed an improvement. Just a thought before spending mega money.
http://forums.swedespeed.com/showthr...-D4-VEA-owners
Here's a link
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