Nothing useful to add but I have this same sound, only seems to happen in the first few minutes of a drive. My truck already had the brake booster update installed when I bought it. 25 PB with the standard key(not IA)
I want a set of those but I don't like how the BLIS module is mounted outside of the housing. Might be alright for warmer climates but I don't think they would survive long place with winter and salt. They look good
Seems like some of you guys are confusing two different things. There is an outside noise for safety at low speeds and some vehicles play fake engine sounds inside through the speakers to "enhance" engine sound. My Ranger had it for sure, I had to disable it when I added a subwoofer.
Factory installed rear step. Dealer spec'd the truck and I don't care for the way it looks. Looks like it's made by Amp Research. Taken off at 1000 miles. $50 + shipping OBO.