well...considering we have the same engine, it may be useful my info:
I run it on the downpipe, 1 inch after the turbo. Car runs 1200F (650C) or less. It can go up to 1350F (700C) cruising, but it may switch to open loop right before it reaches those temps.
You may not run over that boosting or cruising. More than that, you are running lean. Less than that: rich.