Am I being too picky? When my engine runs; I used to not be able to hear it. Now I can hear what almost sounds like a belt rotating. Minor quibble I suppose but I don't like the fact that I didn't hear it before and now it has this rhytmic whoo whoo whoo sound.
and it only seems audible to me; but I can just 'feel' when something is different with the engines or tires of my vehicle. I guess I'm tuned into stuff like that too well.