Reviewed By David A (GARDENDALE, AL) Reviewed for a 2007 Chevy Tahoe —1/6/2015 3:33 AM
I have on tried the 87 tune. You can tell a difference in power but not a lot of savings on fuel.
Reviewed By Timothy S (San Jose, CA) Reviewed for a 2011 Chevy Tahoe —6/13/2012 2:16 AM
Used Cortex Programmer with, K&N intake, and Magniflo muffler. Around town MPG improved 1-1.5 and Highway about the same. More power, shifts are smooth and engine sound is awesome. Programmer was easy to install and I am not a car buff. Once you program the computer you un plug it and are good to go.