What kind of vehicle? I know the 96-98 Cobra's have one but most guys usually just block it off if they have an issue with it.

Here's some google results.

http://www.google.com/#hl=en&source=...6c79a56c95bda8

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'70 Chevelle Malibu- 454 BBC, 275 DR's, in progress
'92 Mustang GT- 5 speed, 3.55s, UD pulleys, Flowmasters
'98 Ranger 4x4. A few things here and there.