k31th less WHY; more WOT Site Developer 28,291 Member For: 16y 9d Gender: Male Location: Melbourne Posted 29/04/16 01:22 PM Share Posted 29/04/16 01:22 PM Yep, it's essentially a valve that's closed unless the pressure is lower on the inside than the outside. If you were on boost then it being backwards would mean the outside air is lower pressure than the boosted intake which would mean the valve would float open and boost would leak out. Link to comment Share on other sites More sharing options...
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