Parts arrived on time but had pieces missing. The initial customer service was great and speedy. Once the packages arrived, we started installation (Friday night). There were some missing pieces in one of the kits and the programmer power cord didn't work. After speaking with customer service the following Monday (not open on weekends), they credited me store credit for missing bolts and got me in touch with RaceMe for the new cord. The guys were very helpful.

Better MPG and more HP BEST INVESTMENT Shipped well and nothing was missing for the install. Its like buying a whole new truck with the new performance. Would recommend anyone with a diesel that wants to increase MPG and HP go through Diesel Ops. Only downside is they have an allen wrench bolt for the throttle valve delete kit and had a bolt break off when tightening down (probably installer error). I replace all those with 10mm bolt that I pulled off of the existing and was much easier to install and create a good seal on the gasket. All in all best investment I have made on my truck since buying my truck.

Great company to buy from. I purchased a kit for my powerstroke with h&s mini maxx. I couldn't install the tuner tof my truck so I tried to call hs and they are out of business. So I called dieselops.com, someone said they could help me and would send an email with instructions. I waited 2 days for the email before calling another company who sells these tuners, who helped me over the phone within 10 minutes. So long story short, they sold me something at a great price, and didn't offer any troubleshooting help. Won't be using them as a supplier anymore.

Lack of communication shipping information was never updated and when we called because it had been over a week since we ordered they had not even shipped the product out. Chris called to explain what went wrong and offered some suggestions to not have this happen in the future.

Ordered a tuner for my farm truck and… Ordered a tuner for my farm truck and installed it and my truck ran worse than before it was installed. Sent an email for a return label and got a return email that said they don't except returns on parts that had been installed. I'm out $500+ for a tuner that does not work... Will never order from them again. Be careful about ordering from them.