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 Jose C (Lawndale, CA) Reviewed for a 2007 Chevy Tahoe —4/29/2009 9:22 PM
I love the CORTEX I installed it in my 07 TAHOE I currently have dual MAGNAFLOW and the K&N cold air and AIR RAID throtle body spacer and still felt I needed some more. My wife and I noticed the difference like right now, I did hear some ringing from the engine but went away after a couple of days. The only down fall is that all of my PC's @ home are APPLE and I am unavailable to update the programer. I have e-mailed SUPERCHIPS and have yet to hear from them. I still recommend the CORTEX to any one. I just order one more for my wife's 03 DENALI.