would OEM side and rear skirts affect performance?

[chiggaz]

hi!every R member:
as the topic shown above,do u guys think would the OEM side and rear skirts affect perforamnce no matter on highway or race track?cuz some people told me da it's gonna be slower for drag but more stable on highway...........thanks!!!

[jorge]

adds weight..a bit.

[RGoose18]

Added weight = slow