The BigStuff3 GEN3 PRO SEFI system is the first programmable “powertrain” control module for “today’s” SEFI, Coil-on-Plug (COP) engines and electronic controlled transmissions. The GEN3 PRO SEFI system offers many unique features that sets it apart from the competition. Features such as dual “Wide Band Oxygen” (WB02) air/fuel ratio control,individual cylinder & spark compensation and onboard data acquisition are just the beginning!