[NivekSTI]

hey dudes i just did my first oil change, and to reach the oil filter i had to remove the plastic undertray that was blocking it, do i need to put this peice back on? if not i'd prefer to leave it off that way i can do quicker/ easier oil changes in the future.

[Evan]

Well, unless you want to risk some road debris smashing your oil filter, I'd put it back on. Also improves aerodynamics.

[solovus]

put it back...it is so easy to remove and it keeps road debris from kicking up into your engine compartment. I would definitely keep it on at all times.

[Deuce Cam]

You don't need to put it back on but I would recommend it. It will protect parts on the underside of your engine such as the oil filter from getting hit by road debris. It also helps with aerodynamics and will help keep your engine clean.

[snorky]

yes you need it. it is necessary for the radiator to function most efficiently and for engine heat to be drawn from the engine bay.

[chaos311clarity]

NEED? no... but should you... probably. lol

i havent had one on my car for over a year... but im guessing thats why my oil temp sensor is ****ed. lol.

[crf-sti]

i left mine on, it only takes a minute to get it off/on and it protects and keeps everything clean under there. i vote to leave it on! just my 0.02.

[sleepsindirt]

a other member pointed out to me that with it off it creates a problem with air flow through the TMIC

[all4bspinnin]

dont have to have it.... but highly recommended...

remember, the colder the exhaust manifold, the slower the spool...

[Szumita]

id definatly leave it on...

[stratguitarist]

Originally Posted by snorky

yes you need it. it is necessary for the radiator to function most efficiently and for engine heat to be drawn from the engine bay.

But theres no slits to drag air out??

Ive had mine off for about 6 months with no issues driving 100 miles per day. My Oil and Engine temps have not increased and ive never had an issue with anything being hit under there. In my opinion its more for protection. I do however plan on getting an aftermarket alternative to put there, its just not that high on my list of priorities.

[amg destroyer]

You should keep it on. Supposedly it helps with aerodynamics as well.
I've had mine off for a while, but am replacing it with a Beatrush underpanel. Much better design IMO.

[wdb]

Subaru engineers didn't put a piece of plastic under the car just for looks! Keep it on the car. It aids airflow through the engine compartment as well as smoothing out the underside of the car to improve aerodynamics and downforce.

[turboranger]

Originally Posted by wdb

Subaru engineers didn't put a piece of plastic under the car just for looks! Keep it on the car. It aids airflow through the engine compartment as well as smoothing out the underside of the car to improve aerodynamics and downforce.

well said, subaru didnt spend money on something that didnt actually function, unlike some domestic cars (mustang fake scoop,trans am fake ram air scoop).anyways the tray is really there for keeping turbulence in check when at high speeds, the JDM version gets an extra piece that covers the tranny ( wish we got that option ).

im sure you get the point by reading what others have posted.

[Rexspeedworthy]

I wish they would have done like on the 05 LGT. There is a little door with about 4 popits you remove, swing door open, and remove oil filter. There is also a spot to access the drain plug removal. Seeing the cars are nearly identical, seems like Subaru cheaped out on this undertray.