Custom remap or a standalone ECU really brings the torque up, all over, with a nice midrange plateau around 160lbft. This improvement all over in torque output makes the difference that you can really feel, but just so happens to result in ~170bhp peak. So, although the difference between the custom/standalone and what you have currently is only +5 increase in peak bhp, the peak torque increase is more like +12lbft. This is without uprated cams, or a ported head, but adding these will go even further.