My car has no cats and it sounds awesome
There is a vid posted somewhere.
I agree with the smell, mines smells like it's burning coal lol. It's running very rich just now but if you stand near the exhaust when idling your clothes smell as if you've been at a fireworks display. I love it though and once it's mapped in a couple of weeks and running a bit leaner then all should be good.
It depends what exhaust set up your using with the decats as to what sound. As to chavvy, I disagree, racey yes. I suppose it depends what you want the car for. Mines is now a track car and modified to suit what I want it to do.