Over the last few years, Direct-injection fuel delivery engines are being introduced by many car producers. It is a welcoming trend for the performance cars, more power is achieved with good fuel economy. For those who wish to push the power barrier further, squeezing more fuel out of these direct injection engine is a real problem. A secondary set of fuel injector for each port is one solution, but requires running two fuel lines to the engine bay and a second fuel pump. An third party programmable fuel controller is also required to drive them.