We do not connect to the factory airbox on an NP300 as the airbox itself does not provide an adequate seal on the factory air filter.
When driving in the rain, water hits the leading edge of the snorkel and then the wind pushes the water up the snorkel, similar to how it does on your windscreen. When the water to the top, because the engine air speed is greater than speed in which you are travelling the engine will suck the water back down the snorkel. We have seen stainless snorkels connected to the factory airbox wet the factory panel filter, which causes it to distort/disform, sucking it in and no longer sealing as it should. It then dries in that position, in turn letting dust and dirt past the filter and can cause turbo and engine issues.
In a NP300 we also have to remove the factory washer bottle and relocate the ECU 90 degrees to allow the piping for the snorkel to run through the inner guard, both of which we allow to relocate and bolt to the front and back of our supplied airbox.
