I think they are installed on the S to reduce noise and vibration, it won't affect brake efficiency if you do not reinstall them. Base versions don't have them.
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2003 2.7 Boxster - Tiptronic - Carrera wheels - OBC - Red calipers - Cat pipes - Modified muffler - Rear speakers - K&N - Litronics
2006 V6 Mustang
2008 ML 350
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