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I have a PSE on my 01. The sound for my taste is just perfect, not loud, no drone. I have mine without the bypass switch (always "ON" by default). There is a video/sound clip on youtube (search for PSE). I would characterize the sound to be close/tad louder than a stock 996. I did the install myself, it took me about 2 hours for the install. No significant power increase.
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