I will, thanks for the info. I know a member at NAIOA with a 2005 Impala who is very familiar with the DHP PT. I'm hoping to pick his brain a lot on it. I'm also hoping to get a lot of help here since I know the PT is popular with GP owners as well.
Other than the guy at NAIOA, I think you will have better luck on the Powrtuner forum than here.