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.
First of all I want to intro that I am just a 'small boy' thats need useful advice from all the Masters/Sifus out there. I just bought a Mitsubishi Lancer MX (CK2A) 3 months ago. The...