I don't agree with either of you. If you look at the pictures it goes overtop of the factory bumper, just like a Xenon lip does.
You can see the seem along the bottom of the factory 88/89 moulding all around.
The Mugen bumper is a complete replacement, unlike this one. It doesn't have a moulding, the turn signals are flush and not sunk like oem, and the bottom of the center opening is straight not curved:
My apologies. I didn't look close enough to see that it's an overlay. I mean, I still wouldn't call it a lip, but it's not worth arguing about. :cheers: