It really depends on your EGTs. The turbo converts a lot of the energy in the exhaust reducing temps; greater ignition advance reduces EGTs (but increases engine temps); higher octane fuels tend to burn a little cooler.... There are a lot of factors, but it comes down to the exhaust temps. If your wideband has reliable sensor diagnostics go ahead and try it out, if it over heats pull it asap and move it; I just don't see the point in bothering really.
Oh and make sure of the sensor placement before you drill your downpipe for the sensor bung; make sure the sensor is going to clear everything and make sure the sensor is higher than 10 o'clock and 2 o'clock or it may suffer damage due to condensation.
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