Mine still idles quite smoothly but from what I gather the EGR is closed after 60 sec of idling (and at wide open throttle). It's mostly in use at part throttle (to varying degrees) according to the ECU control parameters (speed, throttle opening, engine temp, engine load, etc.).
I don't know whether it's my imagination, but it seems to have a bit more throttle response now, after the mod.
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