Why not go with a Borla muffler + glass pack to dampen it and add the Tundra TRD tip? Take your 4Runner to the Truck Shop in SD and have them do it instead of ORW.
ORW is alright and it is pretty cool that they have all those parts laid out but I wouldn't let them work on my truck.
You are in San Diego which is why I mentioned it. I don't know what the "Truck shop in Coronado" is. There is only one business in San Diego listed as The Truck Shop. It is located in Miramar, San Diego between the I-805 and I-15 on Miramar Rd. It is not a chain business if that is what you are asking.
The Truck Shop - San Diego - Toyota, Lexus, Scion