If you really want a clean and best way to use wider rear wheels is to mini tub.
Job is not hard and it is all hidden under the hatch carpet.

Your cutting the inside of inner fenders and adding a new one that is wider and fits closer to center of hatch.
Seen here in carbon fiber

Also notice on left side there is a air vent. Assure it closes correctly and is not stuck open as more wheel noise would enter inside.

You will also see the cables to allow to open gas door and hatch latches

Attached Files C5tube.jpgmintube.jpg

Team ZR-1
True Custom Performance Tuning