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Old 02-13-2013, 08:45 AM   #4
trademaster
 
Drives: 12 MP4-12C, 16 Quattroporte
Join Date: Mar 2012
Location: Working
Posts: 707
It could be a blow off valve or a bypass valve. They both have the same purpose, but function differently. Some of them have noisemakers and whistlers for the ricers, but others aren't all that loud and obnoxious.
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