tbh the induction kit isn't really going to do much on a 1.4... at all, except add noise. the biggest restriction in the 1.4 is the ports & valves in the head, along with the teeny weeny throttle body and the exhaust manifold. first port of call for me if I were tuning a 1.4 again would be the exhaust manifold. the one I had on my old 1.4 (which Tommo now has on his) gave a VERY noticeable improvement in bottom end torque, along with making the engine feel less restricted at higher RPM (basically it would run out of any real puff at 6000RPM rather than 5000RPM). I also had a decat in there which had a similar effect, but to a lesser extent than the manifold (be warned, my car failed its MOT without the precat that the manifold replaces, despite having the main cat in place).
the short version is don't bother with an induction kit until you've done a few other things first. until then you're much better off with the better filtered air going into the engine.