whats the balancing pipe do?
my guess is it balances the exhaust flow, but whats the benefit of this?
"It helps to "draw" the gasses out of the chamber, using the momentum of the gas travelling down the pipe to suck the residual gasses out of the combustion chamber. The gas travelling down the pipe creates an area of low pressure behind it. This not only purges the combustion chamber, but also draws more mixture into the chamber during the valve overlap period.
So, instead of having high pressure exhaust gas popping into the inlet tracts, you now have a partial vacuum inside the combustion chamber, which pulls the fresh charge into the chamber when the intake valve opens."