my father has a mb s500. it has a 5liter v8 and was pretty badass when it came out. now i think there is the s600 with its v12. the s500 is very nice. very luxurious and it has a very torquey v8 engine. 320hp i think.
also when i was at the us grand prix they had amg 55 safety cars. in between practice sessions they would race around the track. the exhaust note of them were very throaty. one car would really haul ass around the circuit.