Well after getting my 147 and swearing blind i wasn't going to tinker and add aftermarket parts etc, i gave in after only a few months!
I picked up an oval tailpipe stainless backbox from w4rdt at the weekend and had it promptly fitted. the old original alfa box was doing the usual rusty flakyness and falling to pieces so it was more of a cosmetic upgrade than anything else. But it's also given it a lovely boomy sound when its nicely warmed up but nothing that detracts from the engine noise thankfully.
Overall i'm very pleased and now considering picking up some lowering springs and possibly coliovers in the future. So much for leaving her as a standard example!
Pics to follow shortly, didn't have chance to take any this weekend.