Hi guys,

wondering anyone had clues of what is happening to my evo9 AFR as it isnt stable after full-tuning had been done to it? i am running a SM4 standalone ecu with about 400whp but 2 mths after my tuning, the ecu leans out on the lower rpm(fr 1500rpm till 3000rpm). so i sent it to back on the dyno a week later and did a power run. Lost whp now as the AFR map shown a Rich out effect. i heard of friends who had such encounters with the sm4.. just wondering if anyone had clues to rectify it ? cheers