I ordered the 149cc kit, S1 Cam and flashed ECU for my 2023 Honda Grom. I sent my ECU to them and it was received on Wednesday. They flashed the ECU and sent all my parts that same day. I received the order the next Monday. I had some questions during g the install and David responded quickly to my emails, allowing me to manage through the install within one day. First tap of the start button and it started right up. Runs great. I really appreciate a company that is responsive from beginning to end. I will use DHM for future upgrades as well.