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.
Good day. I'm a proud owner of a Proton Inspira 2.0E. 2012 model, purchased & collected 30th July 2013 which makes my car is only 6months old. All 4 tyres are Continental which came with the car.