if u want you can source the mechanical parts from kedai potong and then DIY... otherwise... honda SC can do it for a price la. honda SC can also offer u second had parts if you want
What is ur boost reading when maintaining at 180 km/h?? Mine is 0.5, if i keep it below 0.5, bov keep on venting air like leaking. Izit bov leaking or this is normal.