Sounds like the seal is old or collapsed and rough roads allow contact at points with very tight clearance, or the brace moves enough to contact the hoods. Cover the inside of the affected area with that carbon paper used in receipt books and drive on rough surfaces. See if it shows any contact points.
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'04 Boxster S 50 Jahre 550 Spyder Anniversary Special Edition, 851 of 1953, 6-sp, IMS/RMS, GT Metallic silver, cocoa brown leather SOLD to member Broken Linkage.
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