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Don't put the wideband where the stock o2 narrow band goes.. you'll destroy the sensor. Best to install it further down where post turbo exhaust temperatures are lower.

Usually kits come with an bung that you weld in. Just bring it to an exhaust shop and they will do it in half an hour. Just make sure the bung slightly points down to the floor so you don't get condensation issues on the sensor, so install at about 10 or 2 o'clock 

Live dangerously. Or take the downpipe off and take that to the shop.And don't ask for a cheap sensor and gauge. Do some reading and find what is a GOOD sensor and gauge.

If you only take the downpipe to an exhaust shop, you wont be able to tell whether the sensor will foul with the body of the car. Since the wire coming off the sensor points towards the body, it is a fine line between getting the sensor vertical, having the sensor clear the body and still have enough room to screw and unscrew the sensor.

From memory the sensor needs to be something like a minimum of 60deg past horizontal to stop moisture issues in the sensor head, which doesn't leave much room to get best angle without hitting on body...so yep really need downpipe on car when marking/fitting into right location.

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