Sir no doubt VItz is the best hatchback but its not a GTI or EVO (at least not the one with 1KR - FE).
Even the best CAI cannot add up more then 5hp to Vitz, how can it beat a 100PS IVTEC City even if its an A/T is still a mystery to me.
I can offer you to race with my 5 years old EXI PROSMATEC running on CNG and I will fill your Vitz with Jet fuel (if it can take it) plus your CAI and you can also add up a high performance exhaust of your choice.
All you have to do is to make a 20 meter distance with or without traffic whichever you like.
D15Y3 can reach 100km/hr mark @2nd gear before the rev limiter kicks in, on petrol D3 is more then enough to beat any 1.0L stock vitz in City.