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I was at our local dealer yesterday and they had a customer's car in for service that had the muffler bypasses installed. The service team at the dealership thought the car sounded terrible. I thought the car sounded terrible. It was too loud and the tech that drove it said it caused a very loud droning resonance at speed. Don't do it.
I have the PSE on my 997 C2S (with the speed sensor vacuum actuation disconnected) and it sounds great!
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