For the record, nothing has been changed on my car since delivery other than the driver’s experience. ECU/PCM is stock. Air filter is original. Nothing after-market at all.I did dismount the stock rears and strap on three-year-old BFG 315.35.17 DRs, graciously lent to me by Dick Link. :thumb These tires are perfect for the C6Z in that they don’t overwhelm the finicky LS7 clutch. And, if properly heated, they can provide excellent traction. I also raised the stock front tires to 40 psi; above that the DIC starts nagging on start-up