It's not the peak point of the dyno graph that gives thd driving experience, it's the area under it. A true remap will gain low down, mid range and top end. Most Tuning boxes cannot do this as they cannot control or affect boost pressure. Yes, the tuning box will give you a gain and most people would be pleased with result. However take the same car and a high quality remap (not the 150 quid mobile bodger) and the difference would be obvious to anyone.