Please help. I've never purchased or used tuning software, but I'm willing to buy, learn and do. Here's the problem, I have a 2006 CTS-V I just purchased. The previous owner had long tube headers , high flow cats and cat back. I own an OBD scanner and my readiness monitors are good to go except for "O2S" and "Evap" I am doing the GM drive cycles over and over to no avail. Can I create an "emissions" tune before that turns all of the evap., DTC to "no error reported" so they all go to complete as soon as they key is turned on? If so, how can I go about doing this?

Any help you can offer would be very appreciated. I'm frustrated and at my whit's end.

Thank you