you would have to baffle your exhaust perfectly to make it sound like a ferrari, as the frequency they put out is typically much higher than the actual frequency the engine is putting out, giving it that screaming sound without hitting 16,000 rpm. Also the sound is travelling much less distance in a typical MR ferrari configuration than in a FR configuration. Not saying it can't be done but don't expect it unless you have an exhaust specifically made for it.
If you listen to the ferrari in the beginning of this clip, you'll see that without the baffle system in place, it sounds like a high-revving small-displacement v8
http://www.youtube.com/watch?v=EtHZconkNGE