I have an 2012 SS Auto V-8, I'm around 600mi and it seems like power has dropped. For example I had tires spinning with TC and ST on at around 200 miles now seems to not spin them even with TC and ST Off (When at stopped position then flooring it) The 0-60 was six seconds which seems slow; the car was warmed up and was a 60 degree day. My question is this normal to have a dip in performance? will power return? I have not Been hard on the car just a few hard accelerations. Anyone else out there with the L99 experience this?