1-800-450-5333 Toggle Search Account Checkout Cart Product/Power Modules Contact/Email Us Home Page Express Shipping Module Q & A Search site Submit search TRUCK MODULES POWERSTROKE CUMMINS DURAMAX INFO Guarantee Testimonials Smoke Tells A Story 6 Tips to Better MPG DISCLAIMER OF LIABILITY Cummins Info Nav Menu 6 Nav Menu 7 Nav Menu 8 Return to (2017-2020 L5P) Duramax 6.6L PRO Performance Module Sort By:: Most Helpful Newest Rating: High to Low Rating: Low to High Page of 2 2019 2500 HD Duramax July 19, 2019 Reviewer: Marvin Sumrall from Oak Grove , LA United States I was totally amazed with the increase of fuel mileage. He power increased as well. I would and have recommended this product to my friends. Was this review helpful to you? 2019 Silverado 2500 hd June 1, 2019 Reviewer: Alan Gibson from Nampa, ID United States Getting mid to upper 20s mpg empty. Was this review helpful to you? 2018 Silverado 3500 HD Duramax 6.6L May 9, 2019 Reviewer: Tim Rogers from Festus , MO United States Love it is everything I was told it would be 15%fuel milage increase . Nice boost in power Was this review helpful to you? 2017 duramaz March 29, 2019 Reviewer: wendell singleton from chatom, AL United States when the module is working right it is great but about once a week it will drop my milage down to 12 miles per gallon for about 20 or 25 mile this last time it did your people told me to unplug it for 15 minutes and reboot it and I did but only have about 200 miles on it now and it has performed like it should but if it cuts me back to 12 miles to gallon one more time you will be getting it back. Was this review helpful to you? 2018 Chev HD 2500 March 13, 2019 Reviewer: William H Gahagan from Sarasota, FL United States Super easy install. I was averaging 9-10 mpg around town and jumped to 14-15. Definitely runs less restricted!!Would buy it again! Was this review helpful to you? 2017 GMC Denali February 17, 2019 Reviewer: Terence Carroll from Stevensville , MD United States module works great, more power and better fuel economy. highly recommend !! Was this review helpful to you? 2018 November 9, 2018 Reviewer: Robert Jorgensen from Valrico, FL United States 2500HD Was this review helpful to you? November 1, 2018 Reviewer: Noel Wellborn from Johnstown, CO United States Was this review helpful to you? 2017 August 23, 2018 Reviewer: William Hammock from wilson, NC United States 2500 Chevy Was this review helpful to you? 2017 duramax July 20, 2018 Reviewer: Thomas Cook from Magnolia, TX United States to soon to tell, only been installed a week Was this review helpful to you?