Hahahahhaa whoops. Short term memory loss huhu. Yeah you pakai standalone, so I would say pretty confidently it's the problem with your tune. If you don't mind me asking, who was your tuner? Main api means what? You got launch control/flat shift enabled? If you do it occasionally it shouldn't cause much problem kot depending on how aggressive it is setup, but it CAN cause damage in certain scenario. My 4g18t grenaded pretty spectacularly while I was on my rolling launch control where the ignition went to like -20deg retard at 5000rpm full throttle 1.2bar, one of the pistons decided to say bye bye. But other than that self destructing piston, the other pistons were actually perfectly fine. What I mean by your tune problem is your ignition map, it may had been too aggressive(too much advance) at certain point of the map, either that or your 'distributor', more accurately known as a crank/cam sensor which can be adjusted on the earlier generation Mitsu engines, might had been advanced inadvertently which would throw your base timing off and advance the whole map in real life. How much boost you were running?
hahaha..i thought u know main api means wat..for now i assume it as ignition timing. No, i didnt have and launch control or flat shift enable. Tuner is from the shop calvin/Kevin iinm from ken racing. only 0.7(daily) and 1 bar (weekend). yea, the distributor can be adjust but wouldnt the tuner check that before tune?...i was busy video recording first 30min on dyno. hahaha