to redirect the exhaust flow from the original flow to shorter exhaust flow.
So , like using straight piping without muffler la after the valve open coz the air will go through the new hole.
hello hello all my sifoo and RE frens its been a while i didnt post...
anyway i wanna make a survey about yall fuel cosumption.
i running everything stock turbine intercooler ecu all stock but my fuel...