Even though I have my 16's on right now this should give you a good idea of a 1.3" drop wheel gap. I can fit about 2 1/2 fingers between the wheel and the fender.
I got my pro kit on today. Don't get sportlines unless they are cheap, or you don't have subs or plan to get a body kit. I thought it was too low for my body kit desires to go on, so I raised it on pro kits. Not much difference, but enough to help me out. I snapped a few undercarriage pics b4 and after to show difference. I'll get those up this coming week sometime. Also, I have 2 audiobahn aw1200 12" subs in the trunk/hatch. The magnets are HUGE if u didn't know. They weigh a lot and made me have to get 205-40-17 tires to prevent scraping. Pro kits are the way to go unless u have no audio and u are all go.