That could be... but if that was the case, you kinda would've expected the company selling it to write that in the description when selling it in a US market. No mention of it anywhere. But as to the build quality of the Prodrive exhaust... it's nice!

 

Well... I finally got in contact with GT Imports and according to them, it's because it's for a turbo GC8 and not a NA.
I guess there's still a whole lot more I still need to learn about the GC8...