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Valley996TT
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With a Turbo S you should have the K24 turbos. You need to get the car in manual mode; find a long stretch of road; put it in 4th gear; and when you get to around 65mph, go WOT and look at your boost gauge. If you are stock, you should see 1.0 bar. I have a 2003 X50 (with the K24s) and that is what my boost reading was when I did this test. If you're only seeing .7 bar, you might need to get your car checked for leaks, loose hoses, wastegate adjustments, etc. .7 bar is what the K16 turboed cars hit when stock. Good luck.
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You should replace both the wastegates and the diverter valves. I just had my X50 computer upgraded, along with the wastegates and DV, and am seeing consistent 1.1 - 1.2, with peaks of 1.3. With your stage 2 you should be seeing 1.2 bar boost. The stock wastegates are programed to open at 1.0 bar on X50s. I went with the EVO wastegates. Also look into upgrading the spark plugs to cooler ones. I blew my stock spark plugs and will be replacing them with Denson Iriduim IK22 plugs that are suppose to run cooler for the increased boost. Good luck.