yep the traction thing is right. basically the high bost option doesnt give you any more hp it raises the torque going into the front wheels. i got mine rolling roaded when it was pretty standard and i got the same reading in high and lo boost for both readings but the difference in torque was much more. so yes low boost will save petrol and is less strenuous on the turbo but removing the restriction on a glanza is a worth wile thing to do lol yeh it gives you slightly more boost removing this option cause only one pipe going into the actuator spools the turbo up a tad bit quicker oh and to be precise i believe its low=0.45 bar high=0.65 bar lol