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2001 996 C4 Exhaust, mufflers


Vehicle Information: Model: C4; Year: 2001; Body Type: Cabriolet; Total Mileage: 9500;

I found this 2001 C4 for sale by a man that has three Porsches a few months ago and bought it through a dealer so it would have full inspection and coverage. He kept it in new condition with a total of 6700 miles.I use the car on weekends and decided to change out the mufflers for more power and better sound. I have installed a set of Schnell performance mufflers bought from in Panorama. My question: When I first start the motor, the sound is great and throaty. Within five minutes the sound changes to a very muffeled sound. Why the change? Are the mufflers heating up to cause the change? Is there something in the system causing the sound to change?Thank you for you answers.

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