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Maybe adding this to a car not originally equipped with NPP but has an NPP exhaust from another car on it would be beneficial. But ummmm if you car has NPP from the fsctory..... you know there is a factory switch in the center console and you can also change it in the radio, right?
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2016 1SS A8: FBO + Circle D + P1X + Meth + Tuned by Pray Performance
Stock Longblock
800 SAE rwhp. 9.4 @ 145 mph.
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