Has anyone considered fitting the filter outside the engine bay? Under the expansion bottle is where the air feed comes from (the circular hole), why not fit the filter on the other side of that and then run your induction pipe up and back towards the throttle body.
The filter will mostly only get cold air and because of the mud guard in the wheel well should also avoid quite alot of water spray from the wheels.
Never tried this myself but meant too...so there may or may not be enough space lol
