ok I got my notice and got tested:
Hi-Flow Cat, mid muffler + hot dog + HKS Super Dragger = 94dB
Reverted to a stock system (cat back) 87dB.. was quiet as...
So...it appears you would be close to the 90dB limit with a stock zorst + cannon...I assume most people have hi-flo cats etc
To assist others, what results has every1 else got on the test?