Has anyone here with an s550 experienced what seems to me to be a drown like sound in the drive train when cruzing around 2000 with almost not load on the engine. To me it sounds as tho it's from the rear and at times sounds like 4x4/tire noise. I find the car to be well insulated from outsiders noise, but it does get my attention - reminds me of my fox - also get dash creaks like the fox - must be a mustang thing...any comments I'm at 23,000k

I should add pp1 Michelin's are on the car - are they typically a noisy tire?