Sassan- You can either keep the bypass valve on the accordion tube or plug it off and yes you need need a flange pipe for the bov unless it comes with one like the intercooler kit from driftmotion.
Awyman18- if there was so much pressure coming out of the bypass valve your engine would blow. there is no way for pressure like that to happen unless your timing is off and have back fire coming through the intake, thats possible but your engine wouldnt run. also im not sure if your bpv is going bad.
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