i didnt waste money on IAT, its tied in front of filter.
i didnt care abt vss either, i know chk light comes on ard 50 - 60 km, and stay on
driving ard without O2 sensor, even in early years of my st 20v days i had hard time with O2, and there wasnt any major improvement with O2 . those 4 wires of O2 were always getting mixed up .
i have engine backfire whenever i release throttle to shift
as long as car drifts and requires minor maintance. its a successful swap in rwd