Just a noisemaker. The Mopar stage 1 kit is designed to make the "woosh" noises more often when the BOV is present. Stock surge valve is good for just about any performance level this turbo is likely to make. If you don't like the sound, then don't get it.
My car isn't anywhere near as modified as yours is PVO PT. In fact, the day I was at Lapeer - everybody was turning "magazine" times. Mazdaspeed Protege turned 15.3. Stock PT GT turned 15.2. Stock 03 SRT turned 14.1. WRX (lightly modded) turned 13.8. Stage 1 SRT w/ drag radials turned 13.25(!). I feel pretty good about my time, considering how little I have done to the car (full tank of gas, spare and seats plus my lard-ass in there). Three passes within a tenth of each other, I wasn't going to get much faster either.
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PT GT - Fastest damn lease car I could hope to have...
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