i had c2's before. only thing is that they were 17's. in your case i would go with 215/35/r18. i've got 19's and they are 7.5 the offset is +43mm. the lowering shouldn't be an issue. don't quote me though. i only say that because i've got a small drop on the front end of my car.....you know what yeah that's correct. because of the drop you'd probably want a smaller tire that way you get no rubbing. i hope things work out for you.