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I just put the Corsa track system on my new 2006 Viper with the stock cats. It is louder but not obnoxious. It idles louder and definitely lets the car breath at higher RPM's. Its amazing how much extra pipe there is on the stock exhaust compared to the Corsa. The car is louder throughout the rpm range but sounds like it should have when it left the factory. I highly recommend it.
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