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I've got the option, but I've wondered what you have if you don't have the option- Are the valve and flappers there, but the software is locked out? That would seem crazy...
I couldn't find the NPP setup at first, and someone said the only way to keep them open was with an aftermarket kit that includes a wireless remote to go on the visor.... Then I found the setting on the infotainment settings menu to turn the 'quiet' off. (however, the valves still close during 4 cyl operation.)
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