I installed the FP tune today, and I'm a fan. The shifts are smoother, and the car feels quicker, increasing the fun factor of driving the ST. You can definitely feel the power at higher RPMs, as described. This is my first tune ever on any vehicle, and I'm a believer. Recommend it to anyone leery of other tunes. Although, I'm looking forward to a ZFG tune down the road. For now, the FP tune will more than suffice.