We released a new update today that adds support to the inTune for all older GM applications like C5 Corvette (99-04), F-Body (99-02) and 99-06 classic trucks with the 4.8, 5.3, 6.0 or 8.1 engines.
Also included are 04 GTO, 03-04 SSR, H2, 04-05 CTS-V, etc.
Enjoy!!