You can use vagcom VCDS to check Torque in Nm's then convert to BHP, this only works with petrol's though.
You need to log block 120. Start in 3rd gear, low down the revs all the way to redline.
You may want to log block 115. This is requested and actual boost via the MAP sensor.
If you need any advice on converting the Nm's to lbs/ft then to bhp, give me a shout, got a graph already done in excel.