Enthalpy tuned ECU's are known to run rich, an SAFC will help out with this, also, a wideband O2 sensor (with a narrowband output preferably) and an A/F ratio readout is a MUST. SAFC's will help configure a lot seeing how a pretuned ECU is just that, a generic off the shelf tune that wont work 100% with your setup.
A tuned ECU, plus an SAFC 2 will help fine tune anywhere the ECU is lacking. My KA-T setup went together flawlessly with a stock automatic ECU (slightly more richer than a 5 speed) and an SAFC/ LC-1 wideband for managment. Also get around 30mpg off boost on the low throttle map.
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