if by aggressive you mean low offsets, then theres no way they will hit the coilovers.

Ill be running 18x9.5" with +15 offset. Shouldnt be anywhere near the coilovers, but I will have to run some sort of widebody so I can cut out the original fender.

 

yeah the higher the offset, the more prone to touching the coilover you will be. Like I ran 235s on my stock wheels (7" +48 I believe) and they were about 2mm from the coilover. I was eventually planning to go to something like a +15 offset and widebody like ken is going to eventually do.

 

I've decided on 18x8.5 +48. (If they will fit, I'll call to verify.) I will be using my tires that are on my car now. The 235/40/18. I hope I wont have issues with my coilovers. I guess I'll crawl up under the car tomorrow and see how much room I have. I'm guessing that 13mm. is right at .5". I should be able to lower my car a bit more with the +48 offset.

 

you should be good to go