APR Performance
Varis
Mstache
Arkym
I believe Skyer is working on a splitter (among other parts).
I have an APR currently on my car and it doesn't scrape nearly as much as my FancyWide diffuser, and I'm fairly low. When it does scrape it's because I'm careless going down an incline but it doesn't seem to do very much damage at all. Nothing I've noticed anyway, definitely no cracks. Stone chips seem to be more damaging.
Also there is a CF replica of the Mstache available, but I've heard that's not durable at all. There's a thread or two on that around here.