Quote:
Originally Posted by avalonandl
My experience is NPP is loud when first started no matter what mode. However I have not tried stealth.
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Stealth is the only mode that keeps the valves closed at startup. You're right, all other modes leave them open. You do have to go into stealth mode before turning the car off, I haven't found a way to change modes after the car has been turned off... that's annoying to be honest.