Quote:
Originally Posted by JamesNoBrakes
I had a 2004 WRX. It was a common misconception that you should change the blow off valve so it would make the "psssssssh" noise. The "pppssshhh" came from removing the stock intake silencer. Factory BOV is fine, unless you are going to far more boost with a bigger turbo and you need a stronger valve to hold that back. The modern cars are coming with recirculating BPV as described above.
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I 100% agree! To the OP, your money is best spent on CAI. The factory BPV will definitely give you that BOV sound your looking for but not have near the downside of running a vent to atmosphere BOV. Ideally you should probably still be tuned but I don't really see a lot of downside to running a CAI without a tune as actually installing a BOV! The ECU should be able to compensate for the increased airflow and still function properly.