Boosts Line Pressure & Gives Quicker Shifts At Higher Revs etc... Noticeable If Your Car Has More Power & It Doesn't Like To Shift Properly Between Higher Revs (Revs Gears Out etc)
Try To Get As Much Info About The Desired Setting For "Your" Car (ie Power) ... Because You'll End Up Draining Your Transmission Fluid Again & Again, By Always Having To Take The Pan Off & Adjust It...