Slant six dual exhaust proposal

Dual outlets are probably more for looks. Many current cars jump thru hoops to realize that. Worst look of all IMHO is the single centered "a-hole" exhaust.

The 64-65 HiPo 4 bbl 273 has a complicated custom single exhaust. Why not dual many ask? The factory tested both and got more HP w/ a single pipe. In the 1970's I had a Honda 350-4 motorcycle w/ 4 exhausts. There was a big after-market for 4-into-1 exhausts, claiming 30% more HP. Finally, Honda and others designed a 4-into-1 exhaust. The sellers seamlessly changed to selling separate exhausts, claiming 30% more HP.