Mine was a PITA to get out when I cleaned it and put in my CAI (also took off and cleaned the TB with CRC Throttle Body Cleaner).
On my truck (stock), it is between the 100 deg. elbow and the flex tubing. The hard part was getting the rubber up and over two ridges on the MAF; probably due to the age of the rubber and not wanting to co-operate. I used the smallest screwdriver I had. The metal housing got some scratches in it, but it does eventually come off.