Anyone used this? Recently met someone who used a piggy back controller for tuning his Esteem. It mentioned "PC-programmable piggy-back controller that allows users to retard timing and add fuel to virtually any engine, even on variable cam timing engines (VTEC, iVTEC, VVTi, MiVEC, etc.).". But looks like it will need some minimal level of expertise. Planning to have a visit to the workshop where this is done to check if this is something that can be done by someone with little/no knowledge of powertrains and still tune ones car. Engine Management Systems - AEM Series 2 EMS, Plug and Play Engine Management - Wideband O2 UEGO, Water/Methanol, Stand Alone Engine Management, Piggyback F/IC, Tru Boost Controller, Gauges, Automotive Performance Electronics If anybody is here with previous experience using such system please share your experience as well.