I got mine from overseas.
Standard AFR for BT 20V (or any other EFI engines) should be around 14.5 to 15.5 as the ECU will try to maintain 14.7 AFR, which is the optimum AFR for idling and cruising. For BT 20V, the AFR will be slightly richer during full throttle 13-ish and reaching to 12-ish between 6k-7krpm. Most high revving engines will have higher AFR during high rev as this is to keep the engine cool and keep on the safe side. But anyways, the O2 sensor will not feedback to ECU during full throttle.
Yup bro, serious. PNP to BT 20V socket. I think I will order 5 pcs first next week and ETA 2 weeks.
Yup, read that on sifu Chin's website a long time ago, but recent check at Wing Hin quoted me RM400 and no stock! UMW Toyota usually sells stuff at higher price as they will usually claim to have the parts shipped from Japan.