Reviewed By Erik R (SEFFNER, FL) Reviewed for a 2014 GMC Sierra —9/30/2015 2:13 PM
Instructions need work, however installation was pretty simple. Took me about 30 minutes start to finish. Could feel a small change in throttle response, a healthy growl under the hood, and initially lower MPGs. Turns out you must disconnect the battery to reset the computer. Now I'm getting roughly 1 mpg increase.