I have an 08 SE V6 and it is a little loud also I do not baby it and it has under a K on the car. I have noticed you do hear the engine a little. I don't know if it will get louder or not I have had the car to 100 once for a second and thats all. I would not worry about any break in. I have always driven new cars like I had had it for a while and never had any problem due to hard driving. Todays lubrication and very good machine work make it trouble free with break in.Just drive the car you are being paranoid hearing to many people say I heard a squeeke or a swish or a thud I know it makes me nuts sometimes. I found that the noises were the wind the thud was a bump in the road and the squeeke was gas excaping from well never mind. I say drive it enjoy it if it breaks cuss at it and fix it. Repeat drive fun fix if needed. Until the cars come with nanobots to fix them on the go we are slaves to the car,NOT.