In 1995 I bought a Ford 7.3L Power Stroke Diesel pickup. Knowing that it was the first computer controlled diesel sold in the US, I know mechanics wouldn't know anything about it, so I bought the service manual and read it cover to cover more than once. In 1998 I found an enthusiast's forum for truck owners on the 'net, and since I had the service manual, I became a de-facto expert. Curiosity led me into tinkering with the truck's injectors to make more power. Then people started asking me to make injectors for them, too. That in turn led to custom tuning the engines and reverse engineering the circuit boards for the various control modules in the truck. In 2003 I started a hobby with a fellow enthusiast, and it is now a business with 20+ employees and sales to the USA, Canada, Australia, Norway and Germany!