Was it a harsh cut, like hitting a wall?
if so it sounds like boost cut, possible with those mods. Bring it in to Subaru Wangara, we'll check the code, OBD2 will tell us exactly what the engine was doing when the code was logged

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F.B. Racing
01 WRX (STI badged)
2010 XR5 Focus
06 Impreza Hatch 2.0i