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i have a couple noob questions on BOV's. the first one is are they a universal fit or come in different sizes or how does that work? its for future reference should i decide that i want to upgrade to a louder one...which brings me to my next question, i have a AT, i know they go off when you let off the gas but are they as loud as they would be on a MT or quieter? and is it the higher the psi the louder it is? these might be dumb questions but this is will be my first turbo'd car, the only other experience i have with turbos is riding in my friends WRX.

 
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theyll be the same noise level .....when the gear changes the gear changes.... and all are universal.. some just sell tho listing for certain cars because they'll come with the correct flange for a car... most of the time u gotta have the adapter plate welded to ur car.. which is fairly easy...

 
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oh and if u wanna know the loudest .. well probally the loudest.. its the XS BOV TYPE H RFL... <-(Realing Friggin Loud)