I'm on my 3rd car with a meister R set up and as always I can't fault them. They are a joy on the road in soft mode and then for the spirited drives I just dial them up a few notches. For the money they're a great bit of kit!
How close a copy is the Tegiwa to the toda? I could never figure out what the differences were between all the headers apart from manufacturing quality... :S
Looks a lot like something you'd get off ebay to be honest. The plain chrome plated pipework and plastic box.
Probably still does the job tbf. try the bay you never know what might show up...
I thought 103db was the limit for public roads and 98db at most tracks. You should be well within your rights (if you're confident) to ask them to test it before they issue you with a fine/warning/whatever.