VTRDark wrote: ↑Sun Nov 26, 2017 3:16 pm
Think of it like a rudimentary EXUP valve which creates backpressuere at lower RPM's giving you more torque To see another example with twin exhausts and how they do it, yes it's a Harley but the principle is the same Harley Davidson Dynamic Exhaust System Patent but this is exhaust design / theory so there is no right or wrong way to a degree unless you are good at maths and understand flow dynamics and have a computer brain that can create simulations in your head etc during the design process.
Fabio you probably riding your bikes like your in the Grand National.