That is the Mass Air Flow Meter or MAF. It is the root of all evils of a Mustang owner (jk).
Ed Clark who is about the smartest Mustang guru on the planet recomends that you do not remove it. The purpose of the screen is to impart laminar flow acrss the MAF and the car is "tuned" for it. With that said, all the after-market CAI's don't use them.
I have seen dyno results with and w/o the screen. you will pickup about 5 rwhp with it removed which is really interesting considering most of the CAI's are good for about 7 - 8 rwhp. makes you wonder even more, right? In addition to increasing the hp a tad, the car will run a tad more lean. I have seen dyno results with blown cobra's and the leaning from screen removal was too much on them for the application.
BTW, mine is removed because of my Steeda CAI. (lol)
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Black 2000 GT Vert: Novi-2000 with Intercooler (375rwhp @ 9 psi); Tune by Kauffmans; Roush 380R Body kit; Steeda Subframes; Steeda Strut Tower Support; Deep Dish Bullets; FRPP 4:10's; SCT 4 Position Chip with four custom tunes; Steeda CAI; C&L Pleum; BBK 75 TB; SLP Loudmouth; SLP Catted X-Pipe; Bullitt Suspension; UPR Conrol Arms; Focus Fuel Pump
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