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i just looked at my old OEM undertray. I couldnt reattach it when i changed to a larger bumper. It seems it's main purpose was to seal the radiator. the rubber side fins extend to the bottom of my rad. this oem tray covered just beyond the bottom with a foam strip lining the rad. it also had an AIR DAM close to the front. but my new bumper extends a few inches outward and lower than the oem air dam.
the removal of this piece is what got me started into adding a custom tray. my tray will only go back 7 more inches, so i don't think i have to worry about my engine pressure.
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