my rattle sound happens upon acceleration only, begins at and is very loud at 2500 rpm, very faint almost unnoticeable at higher rpms. whats odd is sometimes it is very quiet, other days its incredibly loud. seems louder after ive been driving for a bit. it sounds like its coming from under the mid section of the vehicle possibly exhaust? i only bought this suv a month ago so im terribly unfamiliar with its workings and whats out of place. if anyone can share ideas that would help that would be amazing thanks.