Reviewed By Todd K (Reno, NV) Reviewed for a 2009 Chevy Malibu —6/8/2012 7:19 AM
Had to remove the ECM to get room to install but was fairly easy to do. My truck runs great now. Same mileage or better but more power for towing.
Reviewed By Linda R (Titus, AL) Reviewed for a 2008 Chevy Trailblazer —10/19/2017 4:11 PM
Jet seems to be the only programmer that works for the 4.2 chevy inline 6. No problem with the installation and I noticed an instant increase in the low end power. this is where the 4.2 really sucks. Don't know why they did not use the 4.3.