Micra K11 air filter

Just a quick question would it be alright to remove the pipe connected to the air box and just have the air box with the filter with no pipe just the hole??
 
The pipe feeds in cold air, which makes the car respond better.
Take it off, and it breathes in warmer air from the engine bay.
Cold air is denser, so more oxygen for the engine.
 
Fit a Nissan Almera N15 airbox with a Pipercross performance air filter you will hear, feel and see a marked improvement in lower end to mid range pick-up with a deep noisy induction growl! B-)

Sounds good, is it a straight swap as I'm guessing the Almera box will be bigger?
 
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