Apexi 415-A001 Power FC Boost Controller Kit Add-on S13 S14 S15 Not only the Apexi Power FC is a standalone ECU management that can modify most engine parameters, but it is also a boost controller. By adding on the Apexi Boost Control Kit, this ECU management system is one of the most powerful add-on. The user can adjust boost settings through the FC Commander and monitor boost levels on the fly.