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Where can I find if I have NPP exhaust? I just purchased a 2015 rs\ss convertible and I do notice a change in the exhaust note from Idle to in gear also notice a metallic noise when the car is cold in reverse, goes away immediately once the car is at operating temp and doesn't come back until it sits over night. (brought to the dealer twice and they cannot seem to replicate).. Wondering if this will resolve that issue as well.....suggestions and comments?
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