Thanks for the input fellas..I've subsequently had a dB check at the local exhaust shop. Measured 95dB at about 5000rpm. So about 5 too much. The Exhaust control valve does sound appealing but I think i'll get a temporary way of quieting down the exhaust till I get one. Either flange plates or fit on a little pea shooter muffler or something. Just for reference I have HKS Front pipes, and a TRUST PE II exhaust system, and GTSS turbo's with MINES dump pipes, not that they would make a huge difference in the dB output although the note of the exhaust did certainly change when they went on.
Only place where I think I would of been spotted by a cop, if that was how I got done, would be the city on saturday night. I did go for a quick drive around town with my little step brother. Trying to find out when & where seems to be an uphill battle though..
Cheers