Everyone knows 2into1 does. That’s why all performance exhausts are 2into1. Even most of the ftr750s have moved to 2into1. They still look like a 2into2 high mount but if you look at the back you can see they meege
and the s&s high mount performs worse than stock. At around a 8hp power loss
True duals are a thing of the past once the tuners and exhaust makers started utilizing exhaust scavenging.
you can talk to your local tuner if you need more info