One thing I really liked about working with them is that they won't just take your money and flash a file if the car isn't ready. For a Monte GTR level build, they usually require a specific set of hardware to ensure everything stays reliable. When I contacted them, they gave me a clear list of what I needed to upgrade first. They are very big on diagnostics—they’ll check everything from fuel trims to spark plugs before they even touch the software. You can get an idea of the hardware requirements and the diagnostic process here https://montetuning.com/monte-gtr/ It’s a very thorough approach, which is why their builds tend to last so much longer than others.