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Now removed the Blitz stainless, and modified and fitted a K&N cone, but fitted down by the driver fog lamp so it can suck in cooler air. 
Re-routed air filter
Now removed the Blitz stainless, and modified and fitted a K&N cone, but fitted down by the driver fog lamp so it can suck in cooler air.
Comments
Good thinking Batman?
It's a good intention Jon, but it can also suck in splash water if it's very low down. I had a K&N on a bike and when that got wet it absolutely wasn't happy, restricting airflow. Looks good though.
Come to think of it, after your sill experience you probably won't want to use the car in the wet again, rather like me!
YRV Tony
hmm, 180 degree bend, not
hmm, 180 degree bend, not good.
Stop messing about and stick the standard airbox and paper filter element back on! (if you want to do anything you can pull off the extra foam layer fluffy stuff on the original filter)
From the testing i have done there is no gain with the YRV's tiny turbo for having a cone style filter, OEM airbox can provide all the air it needs without restriction.
The airbox which has been designed for the engine, on computer, by enginneers with the helmholtz resonator principle, to improve torque and smoothness.
http://www.saltmine.org.uk/randy/airboxdesign.html
Note that the orignal airbox intake is behind headlight and designed for still air intake, not forced. Done to protect against water and debris, but also airbox works better this way.
A cone filter is really only worth doing if fitting a bigger turbo where it's going to struggle with the standard size airbox. Or a major boost increase over standard
The only turbo related restriction worth changing is on the turbine side, a decent flowing downpipe off the turbo is worth doing. Would need to be custom made.
Compared to naturally
Compared to naturally aspirated engines (cooler inlet air does help here), there is little to no benefit of cooler pre-turbo inlet air with a turbocharger. The air is being heated up to the same amount once pressurised.
If inlet air is say 15 degree, or 25 degree, The temp of air coming out of turbo is still going to be pretty much the same.
Only way to get cooler air into engine with a turbo, is post-turbo, ie intercooler or water injection.
The standard intercooler is effective and good when you are on the move, i woudl not bother to change it unless boost was raised significantly.
Infact i still wouldnt change inercooler, but instead fit a water injection kit after intercooler (not to be confused with external intercooler core water sprays).
They work amazingly well.