At the end of the day "mean" exhaust note is subjective to tastes. Generally an engine a big cam(s) or a port job (think rotary) will have likely have a mean sound.
[YOUTUBE]zrDh8zvfH6U[/YOUTUBE]
[YOUTUBE]IeViolISyGc[/YOUTUBE]
Considering the original poster's question has well and truly been answered we'll leave the thread as it stands
Cheers,
Steve