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The stock BOV's open under vacuum allowing faster turbo spool, reduced lag and increased engine performance. I do not believe aftermarket BOV's do this. Atmospheric ones certainly don't.
 

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Sorry to bump thread.

Am I right in thinking that stock recirc valves will still make noise under load when running twin induction and metal piping?
 

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I run 1 bar on steel oem tubs and you can hear them spooling up but I do run tomei turbo elbows, equal length down pipes, decat and a full tomei Ti exhaust
 

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To buy new the kit is about £150-200 I think but the full racing chamber kit is about £600 but the greddy one looks better IMHO
 
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