Well, we're going to see how this pans out...
https://www.ebay.com/itm/For-19-Up-C...s/324004572310
Under $500 for a kit with a ZL1 style splitter and rockers, ABS plastic (unfinished) in "primer black" color. Lip/splitter is bolt on, rockers require drilling and rivets. You have to buy the 3M tape for the rockers, it -appears- the tape is already installed for the splitter.
I talked with a body shop guy and it would be about $400 for him to spray and clear them. That's assuming that the color doesn't match the texture/color of the factory diffuser on the rear and/or I want it more of a gloss color before it goes on the car.
If I decide it's going on the car, whether painted or not, I'll post pics once it's done and I'll try and outline the install process.