Up here in WA, the front plate ticket is usually a fix-it ticket, if you find a place to 'mount' the plate they will usually drop the ticket(zip ties count as mounting aperently) As for the exhaust, I would browse through your vehicle code and see if 90db is the actuall limit that is listed. Again here in WA its against the law to even mod the exhaust, but I dont know anyone who has got a ticket for it.
And on a side note, I really like that 323..... is there a forum or a good aftermarket site for them?