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Never heard of anyone using one and I have never used one.
 

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I think its there to keep out any debris or oil that may be pushed through the line. I am using one with my electric gauge. Could possibly make for a falty sender unit after a while.
 

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I'm not running one on my mechanical Prosport

The VW crowd used to run em with a filter to prevent a buzzing noise in some mechanical boost gauges
 

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I didnt use the one in my prosport electric.
 

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I didn't use mine for the longest time too but then the needle starting dancing on it's own out of the blue ... contacted Prosport and they said the filter is there to keep oily vapours out of the sensor and not mess it up inside. Put the filter on and it's been fine ever since and no difference in boost readings at all.
 

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mine does that once in a while...oh well.
 
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