It's actually been a while since I sent my ECU to DC, but I wanted to leave feedback even though it's a little late. I sent it to them originally to get a baseline tune with my paxton car and they sent it back. I then sent it back after a couple more tweaks and they were very helpful, walked me through how and what they were doing and made sure I understood all about the car's tune. They even helped with some expedited shipping due to me needing to get the car out for a show. Great shop to have as an asset to the Viper community.