ORIGINAL: Alpine
ORIGINAL: sc0tty The lower wing corrosion on S2 and Turbos is not related to wheel arch liners, it is caused by the lower front sill trim which is a plastic gutter that traps mud, dust, gravel and moisture.
I don't agree that it's the lower front plastic trim that causes the rust. Behind the bottom of the wing is a flat ledge, and this is the cause of the rust problems because mud and dirt build up here and never gets a chance to dry out properly. That is why the wings rust from the rear outwards at the bottom, and the first you know of it is when the Wurth starts to bubble. The wheel arch liners curve inwards towards the back of the wing (when viewed from behind), which helps the mud to build up. The lower front plastic trims hang down from below the wing, so any mud that builds up should be of little concern (but I agree it is best removed).