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no its not ok. you will shorten the life of the sensor. you need to mount it further down stream of the turbo. here is a pic of my 02 housing and dp. you can see both o2 sensor bungs. the second one is for the wide band.
![](http://i31.photobucket.com/albums/c393/cortrim1/DSC_0201.jpg)
And is that exhaust set-up custom? i like it.