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Im looking to buy a blowoff valve that vents to the atmosphere for that amazing sound, but ive heard that if a car has a MAF sensor, that using this could make the fuel mixture rich and potentially cause issues. I also heard that it doesn't apply if a car has a MAP sensor. Does the 2018 elantra sport have a MAP or MAF sensor?
 

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I would assume that you have a MAP sensor.

I have a turbo, and for a year I vented the wastegate to atmosphere. I assume that is what you mean, because all blow-off valves vent to atmosphere, that I am aware of.
-2000 Tiburon
 
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