Technically it is referred to as a fascia extension. And sometime called 'ground effects" by the aftermarket boyz.
Car do not have "bumpers" any more, they have fascia's. , plastic injection molded Talc Filled Polyolofins, probably 2.5mm to 3mm thick. The extensions are normally TPO also. Although Mercedes still uses RIM for the M series front and rear fascia.
I know...TMI.
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My Porsche mechanic drives a Saturn.
'98 Artic Silver w/ Tip
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