Stainless for sure. Do it once do it right.
I went custom dual 2.25 stainless setup, 100 cell cats, pacemaker tri-y headers and a x-pipe but manta do a stainless single 3 inch/ 2.5 dual for the utes.
Haven't heard it but am sure someone on here has it. People seem happy with their systems.
Dual 2.5 is $1,527.90 look around for better prices on their gear thats just their site.
Plenty of clips on youtube what a 3inch or a 2.5 dual xr8 sounds like so would be similar.
Thats for the cat back systems. For a complete upgrade you would need extractors/gaskets and a set of high flow cats.