newChevyOwner

So I'm new to this forums and have a question relating to the GM/Borla exhaust. My truck is a 2018 1500 Silverado LTZ 6.2 Crew Cab SWB. I've spoken to customer service at https://accessories.chevrolet.com and then I've also spoken to a dealership near me and received conflicting answers. I was interested in putting on Part No. 19303345, but the parts dept. at my dealership says it won't fit and chevrolet.com says it will fit. Does anyone know which information is correct? Only reason I am looking at this particular exhaust is I'd like the dual side exit, quietness of the touring muffler, but most of all the flapper to prevent the chopping in V4. And that if I go with GM parts my warranty stay completely intact. Any information that can be provided is greatly appreciated. When I do a VIN lookup it says it won't fit and when I put in the specs of my truck I'm told it does fit. Thanks in advance.