Having come from the MC Shift, I think that is the best system for that car to live with on a day to day basis.
OK, your engine is slightly different, but it may be possible to buy the exhaust from someone that has fitted the aftermarket Larini or Tubi.
I would speak to Noor at Performance Italia (click the banner above) and see if he can put you in contact with as he sells many.
If its not loud enough, you could then add some de cats, then an unsilenced mid section. No need to buy, you can have modified what you have (4.7 stock system)
Its worth checking out.