Functionality of lower lip/splitter?

[dmention7]

...or whatever it's called. The black plastic piece that attaches to the underside of the bumper and sticks vertically down an inch or so. I'm just wondering if it serves an actual aerodynamic function, because the radiator for my L-A IC kit interferes with it a bit, so I left it off for the time being. But if it does contribute meaningfully to airflow either under the car or through the engine bay, I can probably find a way to make it fit.

[i12drivemyMP5]

Decoration.........

[flaps720]

some serve as cosmetic/decorative pieces while others have a function. The ones that are quite large, and cover a significant surface area underneath the car, not just the few inches that stick out, serve to smooth out airflow beneath the car and create pressure on top of the splitter, creating more downforce on the front end of the car, thus adding to the overall control and traction.

[dmention7]

Sorry, I probably should have specified I was talking specifically about the stock part... Attached to the bottom of the bumper, and set back several inches. Maybe "air dam" is a better description, now that I think about it

[Wagonbacker9]

it serves the function of both smoothing airflow below the car, and maintaining airflow through the radiator/IC. For a MARGINAL loss in fuel efficiency, and MARGINAL loss in cooling, feel free to leave it off. I HIGHLY doubt you'd notice the loss in either area. when I had my lip off I didn't reinstall this part, however now with the FMIC core in and lip back on I put it in.. even though it stretches the fitment slightly (6" core with NO trimming to the crash bar)

[dmention7]

Thanks, that's pretty much what I would have imagined. Maybe I'll add figuring out how to fit that thing properly to the "when I'm bored" list.

[Wagonbacker9]

I ended up backing the screws most of the way out... it slid into position (almost), tightend em back in.

but thats just my setup... when you're running a custom core rad setup obvously everything is gonna be different. basically everything down there is clearing by millimeters on my 6" by 3" by 26" core...