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Yeah it used to sound V nice, I had the full cat back system and it wasnt too loud and not annoying on the motorway at all, did find adding the K&N 57i induction kit made quieter on the motorway.
Id go for a cat-back system, or even better, a full system. A back box alone will just look nice and last longer - might as well stay standard otherwise IMO. (just ditched a "bad boy" back box on my Williams and gone standard again. no difference)
but there is a difference for me mate , as it scraps when i go in car parks with the standard one on there as my car is so low, so i need to go back to a sport zorst again as the exhaust is up the other way and fits in under the car better