Andy and team were outstanding in installing a Dinan Stage 1 tune on my M550iX. They were very responsive from quote, part order and scheduling. The Dinan kit was installed meticulously with all harnesses zip tied neatly. They went the extra mile and installed the control unit in a much more logical fashion than Dinan's velcro method. My appointment was at 8:30, they took the car in immediately and the amount of time they said it would take was spot on. Best of all, I am very pleased with the increase in horse power to the crank!