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WHat do you mean how to do this? The stock one comes with a screen right in front of the MAF. I guess it is just supposed to block anything the air filter missed from getting in and maybe straighten out the air a bit so the MAF can rea it easier(?). When I got my JLT RAI they said to take it off. I took mine off and have had no problems. Some people say they have had problems with the fenderwell CAI's and taking off the screen. I would take it off and see what happens. If you get a code then put it back on.