Last session of the day and my rear end started making a high pitch whine under load. Took the car home and checked underneath, all looks normal. Decided to just give up and bring it to Z1 on tuesday, when I reversed for the first time all day and there is a bad knocking noise when starting in reverse, coming from the left axle.
However, taped up the wife's Z4 and will give that a shot tomorrow. Just got new tires for it friday too!
Was going to take the new Stang, but the 235 tires on it are just too skinny! breakin isn't an issue cause its a 2 year lease.