Since about two weeks, everytime I start the engine in the morning when my car is completely cooled down, I hear weird sound from my exhaust.

This sound is just like train blowing sound from 3 miles away.
I mean, there is a crossing about 3 miles from my home and whenever I hear the train horn it sounds just like I hear from my exhaust...
I never heard this kinda thing before since i bought my car and i don't hear when my car is warmmed up.

Is this normal? I don't think this is a big problem but annoying.

 

oh shoot... i posted on the wrong place. sorry.

 

maybe you should leave it at the dealers over night so the can duplicate the sound in the morning when the car is cold. That way they can figure out what the problem is and fix it.