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 !
Increased performance and mileage
I recently purchased a module for my 2005 GMC Yukon with the 5.3 liter Vortex engine and noticed changes immediately. The key I found was also adding a new intake like AFE or K&N to allow greater airflow as well as a new exhaust from the CAT back. In combination I am recieving an additional 4-5 milies per gallon increase. I'm not kidding about this and can prove my findings. Please note that it's really important to modify ones the driving habits, like not giving too much gas when excellerating. Overall, the module was well worth the investment and I hope that others will follow the same path. Enjoy!