Well my car came with no under-tray. Should I buy one or just leave it off? Will it damage anything? Same thing with the fender linings. They rub when i turn all the way. Should I remove them or try to tie them back further somehow?

 

My undertray eventually came off, and now without it I can tell there's a difference. More noise under the engine area and when I drive fast the front feels like it traps air. For the lining I would at least tie them back. Mine broke and since it has a metal bracket it cut through my tire.

 

Alright thanks for the input.