The phrase
"turbo inline" refers to a specific type of engine design. It means that the engine has both a turbocharger and an inline configuration. A turbocharger is a device that increases the engine's power by forcing more air into the combustion chamber. Inline configuration means that the engine's cylinders are arranged in a straight line. So,
"turbo inline" means an engine with a turbocharger and a straight cylinder arrangement.
Full definition