[BiturboS4] BOV v. DV

[California Fields]

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Can someone explain to me the difference between a blow-off valve (BOV) and a
diverter valve (DV)? Also, are these things that you all recommend replacing
with aftermarket parts on the S4?  Forgive me if these answers were already
present in any FAQ...I didn't know where it was located.

Thanks much, Carter.

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