This ECM is intended as an upgrade for the 2007-2008 Trailblazer SS. It uses the 2009 operating system modified to not require any changes to wiring when installed in a 07-08 TBSS.
The operating system allows for higher IFR and MAF limits as well as all the other perks of a 2009 operating system.
These are not stocked and hard to come by. Please enter your VIN in the notes when ordering.