Not a lot of gains but you will get a little, especially as it is already cool. in the summer losses will be less though with a FMIC. A FMIC is fitted to reduce boost drop and keep the temps cool within the system. Therefore to say you see gains is true, but not necessarily accurate as all an efficient intercooler will do is maintain the power from the engine better and so the car will be quicker compared to OEM. You will sometimes see a drop in torque with an aftermarket FMIC too. With a live remap you may see more gains, but this would be attributed more to a live map.