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Admiral Ackbar the 1st
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15,697 Posts
Which GFB - some (most?) of theirs come with adjustable recirculation. If it has that, and is adjusted well for it (all recirc or at least mostly), I'd be unconcerned totally.
 

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2 Posts
I have a 2015 wrx and has a stock turbo and an AEM aftermarket intake. Is it ok to get a aftermarket blow off valve like HKS, Greddy or perrin without having it tuned?
 

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Premium Member
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10,112 Posts
No, it means that your car needs a bypass valve not a blowoff valve. It doesn't matter how you tune it. The engine management being mass air flow based does not work correctly with blow off valves.
 

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Æternum
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19,769 Posts
Please read the stickies. /Thread


EDIT: Wow, it's like learning how to moderate all over again with this change
 

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11 Posts
So i've been reading that a bov is not ok due to it being post maf, what if it was plumbed pre maf, would that make the car lean out to much?
 

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Friendly Neighborhood Spider-Admin
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48,699 Posts
Are BOV's still a thing? I can't speak for the more recent cars, but it seems like we squashed the validity of needing/wanting one pretty thoroughly on the GD cars. Or at least, that was my perception.
 

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Super Moderator (Actually a SuperSpy)
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28,508 Posts
Ever hear compressor surge in action?
Yes! Repeatedly and (perhaps sadly, considering how long ago that was) in person during the Group B era. Depending on the car they'd clank or screech and that, combined with the afterfire and the constant whistling that was novel at the time really added to the aura. Anyway, I digress.
 
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