I recently did mine last week. Got Lovell's Superlows rear, and Lovells low on front. I paid $255 and fitted them ourselves. Did it in 1.5 hours (it helps with the right Tools

) I will post a pic when i get to my laptop. I had a S pac though and didnt need Camber kit.
Superlows take you 2'' lower than FE2 or 5cm.
The guy said if it was executive height and a big drop to superlows, you wouldve had to get the camber kit.
As for scraping, none yet, but i find my mud guards do a bit, especially on gutters...