Originally Posted by hey1
So is that turbulence cause by the gasses from the wastegate the important part? or is the seperation of the exhaust gas and the waste gas important?
If so, then wouldn't stock be better than the bellmouth, while the divorced be more efficient than stock?
This concern of mine postpone my decision on helix downpipe.
You are thinking too much about this.
The stock design is crap, and the bellmouth = divorced performance. The turbulence is the bad part, not the seperation of gases.