I really feel sorry for you folks who have to deal with emissions and noise restrictions. I guess one of the advantages of living in a relatively unpopulated area is that I never have to worry about the EPA coming in here and making me quiet down my vehicle or stick a hose up my tailpipe and see if I'm polluting the air too much.
At my last inspection, I had to flash my lights to make sure that brights worked, honk the horn, turn on the left/right turn signals and the guy looked through my wheels at my brake pads to make sure they were "safe". The whole process took about 30 seconds. I don't think he'd have cared if I was running a straight pipe because I never had to start it up, nor did he check for any emissions equipment. I know people who have taken ALL of their emissions crap off of their cars and have never had any problem with law enforcement or the EPA...of course their check engine light is constantly on, but I guess it's worth it for the extra horses you get. <shrugs>
Good luck with your sound "problem". It's a shame that you have to go through all that.