cant really hear the cross over? sounds like a gsi lol but really it does.... are you running stock ecu? tune it with a proper ecu then you will really hear it crossover properly. VTiR ecu will still think you have the dual stage and make you have a retarted crossover. The proper gains will be met when you do ECU + a camshaft upgrade...
you need to adjust your vtec crossover point, my cousin ran a ITR manifold on a B18C2 ecu and it used sometimes kick in at 4500prm sometimes 5500rpm but i can tell you it ran like shit was really slow but after he properly tuned it , it sounded amazing.