Reviewed By Joe D (Greeley, CO) Reviewed for a 2006 Chevy Avalanche —3/21/2012 9:27 AM
This product worked great, i had replaced my transmition and it was shifting very hard, wiht the Cortex the new preformance and power are fantastic
Reviewed By Ned R (Granbury, TX) Reviewed for a 2007 Chevy Avalanche —2/20/2015 9:23 AM
My 07 Avalanche is used for most of our travel as well as pulling our 21' travel trailer. I was very disappointed in the Avalanche power above 50 mph. The programmer has allowed me to pull the trailer about 10 mph faster and has increased my fuel mileage by 1 mpg. I did also add a K&N air intake. Now pulling the trailer is pretty easy. I also get improved mileage around town.