VTEC is performance increasing technology not fuel saving technology, when VTEC 'kicks in' the ECU switches the engine to a performance enhanced cam profile. Get your facts straight.
And all you folks are quite clueless, I can tell you offhand that an EXi is piss poor when it comes to acceleration since I've owned almost every EXi and VTi. It doesn't hold a candle to the VTi through any spot in the RPM spectrum.
The only way it could accelerate slightly faster would be on smaller wheels. On the same sized rims it would lag far behind.