Hey OP, I've no experience with them, but the only example I could find was the EVERCO Twin Loop exhaust for the 350z.
https://youtu.be/Qzrqr77laY4
https://youtu.be/XJHRw1vcuQw
The design seems to have been popularized by Mugen. There are knockoffs made by OBX, but you don't see too many twin loop mufflers for V6's and above. Our cars don't sound like normal V6's though..
Maybe this provides a unique sound for the VQ37?