Sounds good silver! Apart from the K&N air filter, my car is stock standard, so I guess it is the standard blow-off valve. I had not been aware of what this was until I replaced the CAI and that woosh sound didnt go down too well with me at first, gave me quite a shock!. I figured it was just blow-off after I settled down and gave it some thought.
I am going to check out that site, this sounds like an interesting way to go and something I could do (not being one for too much fiddling)
Ok, 1 hr down the line had a good check at stratmosphere. Nice site, I dropped them a mail about the diverter valve and will see what comes back.