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i think he means BOV (bloww off valve)....im sure its rerouted back into the intake tract....but from what i see as how the sti has a top mount it reminds me of my rx7 turbo II....same setup with a top-mount except the BOV is on the side from the turbo to the IC, so im guessen its the same on an STI, except that if you were to upgrade it would be in the same spot unless you go with a FMIC and place it on the TB (throttle bodyside) which in that case almost every drag racer does that......

hopefully this helps ya :-?
 

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Dump valve= routing back to intake.
BOV= atmospheric release (phsssssshhh sound)

*atmospheric BOV's can cause idleing problems on MAF metered engines.
 
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