Works as described so far
No issues. Simply plug the device into the OBD2 port. A few light flashes then it's done. According to the display the vehicle is in V8 mode all the time. Have not used it long enough to know impact on fuel or oil consumption. Oil consumption is the reason I decided to try this.
Amazing, Inexpensive Real Power!
This is by far the first, best upgrade I've made to my Denali! Fairly easily installed (no thanks to GMC) and my 5.7 Vortec started right up with no codes. I experienced immediate increases in throttle response and overall power and drivability. Unbelievably, after a week or so of driving the vehicle, the power and responsiveness approved again! Puts me in mind of the old EPROM chips. I highly recommend this product to anyone looking for low dollar extra horses and low-end torque !