One of the advantages for the ITR is the shorter gearing and identicle HP. Yes, the ITR is blown away in torque which helps it on the launch (as the video REALLY shows) but the smaller turbo hurts the top end, where the ITR is nearly always at with the short gearing. The weights are nearly identicle. I basically see it as a slight advantage to the Silvia in an 1/8th mile race, with the ITR winning in a 1/4m race. This is concerning the red top silvia motor with 205Hp and 203tq.