Thread: DIY - NPP Exhaust Controller
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Old 07-18-2018, 09:34 PM   #3
17rsvert
 
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Drives: 2017 HBM 2LT RS Convertible V6 A8
Join Date: Jan 2018
Location: NJ
Posts: 654
Can you please explain what exactly is being controlled when this switch is on or off?
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