I've heard/read they can make the window not shut properly which increases wind noise, particulaly at motorway speed. Then when you remove them the windows dont shut properly because you've stretched the window seal, and you still get the increased wind noise.
I wouldnt fit them personnally and not just for that reason. they remind me of my grandad as he had them on his cortina. His reason for having them was he didnt want that pesky wind blowing his fag ash back in.
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The 180s the one you want, ain't no replacement for displacement.
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