I am running a stock ka24de-t, with no problem. (First) you need a good running engine (2) upgrade stock ignition. I am running the MSD 6AL. (3) cooler spark pluges and better wires. (4) upgrade your fuel pump and injectors. (5) Proper Tuning is a most. etc JWF ecu retards the timing under boost or get an AEM. The Safc with the stock ecu is ok, but you cannot run high boost, stay blew 10psi.