M7 help

hey guys i apologize for the long post now . i read through the forum and tried many different things to get rid of this top end bog. the sled has a new stator, ecu, power valves cleaned, new spider in the clutch, new valve servo and wires. new fuel pump. pressure is 44psi on the pump. the one thing i did find is that my air box was full of ice at the bottom. we cleaned it out let it sit in the shop for a couple days and it seemed to run good until i plowed the front end through a snow drift. i am thinking its still sucking snow. any other ideas?
sled is 2006 M7 all stock 2400kms. i do see some areas on the intake at the top that have about a 1' gap that doesnt seal the airbox to the hood. definetly a problem and will try sealing that first. any other info is great. thank you

i had a look and am unsure as to how to get the lower part of the air box off that moutns by the fuel log and such. do i need to remove the front bumper to get in there and make sure everything is mounted correctly.
any help is great.
Thank you
Logan

anything else i should check. i dont think they had a lookl through my secondary should i look there as well? need more ideas of what to check. could this be the TPS? thanks guys any ideas are great and i will check them. i am just out of them and am not familiar with these newer sleds and this is my first cat