There's some confusion here. The 7M-GTE uses a KVAFM where the 1JZ uses a MAP sensor based solution. While the MAP sensor bay receive its signal from any location (it's preferable that it is sourced AFTER the throttle body) the KVAFM does not do well in "blow though" setups. The issue is significant distortions in the vortex which the meter actually looks at to determine air flow. Many systems based on other meters/sensors do not have this issue.
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