My '55 Tbird has a stock 1 3/4" through bumper exhaust system purchased in pieces from NPD.  The exhaust manifolds are stock cast iron 1957 TBird. It's too loud, rattly and full of exhaust leaks.  I am in the process of upgrading my exhaust system and could use some feedback from other TBird owners. I found an excellent exhaust shop that can do the job. I am thinking 2" pipes all the way back. Should I run standard mufflers or glass packs?  How about resonators?  Should I keep the through bumper pipes?  I like a car with a good muscle car sound, but not too loud or distracting. Thanks!