Macchina is a key to unlock the control center of your car. Once you are in, Macchina can then be used to make changes and tweaks to your car. You can do anything from simple projects like stopping that annoying ding to more complex upgrades like unlocking more horsepower or improving fuel economy. Macchina arrives to you as a blank key - you have to cut it yourself. Learning how to cut that key (reverse engineering, writing code, and plain-old tinkering) is the fun and challenging part, but don't worry you can do it, because a community of car nerds already exists.