If you want to keep them off I would recommend that you coat the arches with some ACF-50, Waxoyl or even stonechip - after all, you don't want to be fixing rust problems again and again in the same area!

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2000 W Phase 3 Moonstone.

I had my arch liners out for a couple of weeks while I was doing some work on the car. It took a while to clean up the arches before reinstalling them as a lot of road dirt got in places it normally wouldn't, exposing more nooks and crannies for mud/salt. You will get dirt and stuff everywhere such as right up in the wings and the liners protect some bits like fuel filler pipe etc. There will be a lot more turbulent air in the wheel arches at speed so fuel economy will deteriorate to some extent.

Poke around at any underseal - if there are bubbles in the underseal or it moves when you prod it there will probably be rust behind.

I would keep the arch liners on the car - they are there for a reason.

There may be different arch liner versions for higher-spec cars with side skirts (including a lot of late cars and all GTI-6s, Rallyes). Maybe someone else can confirm this?

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Cherry Rallye SOLD

Rear ones still available from Peugot I think.

One side is something like £17 whilst the other side is £40.....

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Cherry Red Rallye .... On going OEM spec resto

China Blue GTi6 .... Weekend toy

Black 208 GTi .... Wife's car now

Silver BMW 550i.... The executive missile