Mine have stayed in place at speeds in excess of 100mph on race track familiarization runs; however, I may zip tie mine just for the added security seeing what these things cost to replace.
They do show up on eBay every now and then; likely snatched from some unsuspecting owner's car in a parking lot (another good reason for the zip ties).
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JGM
2002 Boxster S
1973 911 Green FrankenMeanie
PCA DE Instructor circa '95
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