dsz28

Im relatively new & have a 2002 z28 with only a lid & cat-back. The car is under warranty and I cannot make many changes. One thing I can do is get the engine reprogrammed. Can someone please tell me what that is and what kind of performance/hp improvement I can expect?

Also, as far as street racing goes, where would an A4 want to start a race from?

Any help would be appreciated.