I order the "mud flaps" in Vadim's post above from Ebay, $70 per pair.
Front install was a breeze. For each side you need to pop three plastic body panel rivets (pry the middle button completely out first, then pull the outside sheath), put the part in place, replace the rivets, put in two self-tapping screws. Turn the wheels out of the way to make space to work. The self-tapping screws require a t20 Torx bit and a relatively short driver handle. Do the screws by hand, don't over-tighten, would be very easy to strip out the plastic.
Rear install was a bear! Each flap goes on with 4 robust metal clips, 3 along the wheel well and one slightly smaller one underneath. The underneath clips were fine, but each in the wheel well was a struggle. I'm sure there's a spreader tool or something I was missing, but the clips were so narrow and stiff I fought mightily to get them on, grabbing each just so with a vice grip and rocking it back and forth while really leaning on it, hammering it through a wooden dowel once it found its track. They're solid as Sears for sure, but crazy how difficult - clearly I was missing something but the product didn't come with install instructions.
They look nice enough and will block a little road spray from sullying the lower body panels, but really looks just fine w/o them.too, and they're small so not making a huge difference. If doing it again I'd probably have a body shop pop on the back ones, and might point the $140 elsewhere altogether. But they look sharp eniugh, so I'm happy.