FiTech Go Street EFI – 400 HP System, the low Cost 400HP Street EFI. The Game Changer has arrived from FiTech with its latest addition to the line of Go EFI Throttle Body EFI systems. FiTech recognizes that not everyone needs or has 600HP or a wild camshaft. There is a large group of enthusiasts who are happy with their ZZ4 crate engine or their ’66 Mustang’s factory engine, but still want the advantage that EFI has to deliver. Fitech has taken your needs into consideration and built an EFI designed just for that purpose.