TP are trained to see modified pipes, don forget, they are
riders themselves, they also play bikes one, so spotting modifed
parts are chicken feet to them. TP also have pasir gudang racers
among them.
If u use arrow pipe, u say u donno, do u think he believe u? Unless
if u tell them and let them see ur licence just passed one, and
really dono, maybe will just ask u go inspection. But most cases is
cannot run one..