Long time ago FBO got a GREAT ECU box coded as A688, pretty much similar to the Mopar Chromed box on performance. I tried that too untill failed too, then I switched to Rev-N-Nator. They stopped their production because it seems Standard products who were the manufacturer of these down FBO specs moved to China and began the quality issues

After this they offered a new aluminium box coded as HR688. Some customers got this failling too and found after remove a rear cover it was an HEI Gm module hidden down this Mopar look a like box. Then a totally brand new box came out, the HRR688 which is the one being offered at this moment.