It's best to keep the sensor further away from the turbo. You get a more accurate reading, and the sensor will typically last longer. With that said, I run my wideband close to the turbo, and in 10+ years I've only had to replace the sensor once.
Unless you have some way to simulate the narrowband signal going to your ECU, you will need to keep the stock sensor in there and weld in a 2nd bung for the wideband.
_________________ 91 GSX - 511fwhp and 352 lb/ft 25psi 110 octane, 7.68 @ 95.9mph 1/8th 21psi 91 octane, 11.93 @ 112.9mph, 117.7mph best trap speed, 20psi 91 octane
98 Volvo S70 T5 - DD
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