Hey Nath...i wish ide read this b4 we talked this morning but...
I did the exact thing you have done!...Had Ramair and went to triple k&n's.
The good thing is you have that extension. I got a small filter to cover the end of the sensor from a car accessory shop.Its just to protect the bulb on the end. I used zip ties and placed the filter between the 2nd and 3rd k&n filters on that rod there. To me, that was getting the air temp that the filters were sucking in.
It works a treat for me. I have a photo and you can see the small blue filter.