yeah its on my to-do list (along with a whole heap of stuff lol) but yeah, its not a very big gap at all, the bird was about the size of a small sparrow and with me going 100-110 km/h and the bird probably going 40 in the opposite direction is essentially a 150 km/h collision and would easily force such a small birdie through a gap 1" or so wide.
But as you said, even being a small gap, if a bird can fit through then lots of air certainly is. Intercooler is a real good one too, is thicker than the stock one, and it has the same no. of fins but they run lengthwise instead of across and so they are much wider, and the core is of bar and plate construction rather than tube and fin.