the best way to find out how it will sound (sort of) is this:-
lift the bonnet, on the right hand side you have you air box with a pipe connecting it to the engine, what you want to do is loosen the jubilee clip at the engine side and pull the pipe off then start the engine and go for a very short drive, when you put your foot down youll here a tremendous sound from the engine, it sounds like a 911, it will give a very exaggerated idea of how it will sound.
i must point out though that this isnt good for the engine so if you do try it, dont drive it for long.