I put a ADS chip from Area Diesel (areadiesel.com) on my 2577 this fall,it worked great. You can set in for stock,15% or 30% over, I only ran in the 15%, they say better fuel economy also,but with last fall I did not have time to check it. It was easy to install,just mount the box and unplug a wire and install module wires in between. I installed one one my neighbor 2577 also.