my friend just got a 04 c230 sedan, and compare to my car 03 c230 sedan ....it's wayyyyyy wayyyyy too quiet. i have this rattling noise coming from front left side of the engine, but his has no rattling noise at all !! . his car has 500 miles on it, and my has 15k so any thoughts? cuz it's new? purge valve? or supercharger whine?

 

from what i have heard..people have said 230's engines are louder than 240 just cuz of the super charger....