Radrock, its in V8 at idle but that flapper is dependant on exhaust flow to open, its not electronic just a tension spring, as you accelerate and more exhaust flows it opens. I had my truck idling and it was shut, i manually opened it and vvvrrrooommmm it sounded like a normal truck. I mean all the crap on these things now, i want a truck not a honda. So I clamped it open so its wide open all the time. If you tap where the spring is it will clatter like a cowbell, when mine would go in V4 and it closed it would flutter and sound like the rearend was going to fall out. When I took it to the dealer i removed the clamp and evidently stretched the spring enough that it quit rattling but as soon as i got home i clamped it back open. Mine has manual seats. Ive had 4 loaner trucks, all 2014 chevy or gmc 1500's and none of them made the noises or had issues mine did.
