Best lowering springs for 2015 hatch.

[ScGibbs]

Looking for lowering springs. Or to go lower. Which are best?

Been eyeing corksport and Eibachs.

Running 18" 225 in the front, 255 in the rear.
Fenders rolled clearly.

[S.F.W.]

In terms of springs you have listed the two most popular options. The other option if you want to go lower is coilovers at which point you have various options depending on the price.
What width is your 18" tire in the rear ? A 255 tire is very wide, if you lower, you may need more fender work aside from the roll.

[ScGibbs]

Any insurance issues with eibach prokit or sportlines?

[S.F.W.]

Any insurance issues with eibach prokit or sportlines?
You need to discuss with your specific insurer, most companies are not interested in insuring people that have declared mods on their cars.

[The Wolf]

Most of the time you're fine to modify your car, but be warned that your mods wouldn't be covered in the event of an accident if you don't declare them. You're also risking getting dropped by your insurance company if you don't declare your mods and they find out, or deem that an accident was caused as a result of them.

I was lucky in that my insurance company didn't care what I did to my car.