Is there any point in removing the under tray. Does it increase air flow in the engine bay?

 

id imagine it would upset airflow TBH, im sure sections of it channel air to the front brakes, its not just there to hide oil leaks

 

The underbonnet aerodynamics are carefully set up by Subaru to do what they want it to. By taking off the undertray and leaving it off, you will upset the airflow. I wouldn't leave it off my car.

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I think i'll leave it on then. If it's there for a reason.

 

It also prevents dogs and children and small adults getting tangled up in the works when you run over them..................