Like everyone says here if its got mods then it might be worth getting a vtec controller... one ova my friends has one in his EG Civic, B16 with Cold Air Intake, Headers, Full Exhaust, Remapped ECU.
His not really notice any difference in power, but he can adjust when the VTEC kicks in which is cool... I wanted to get one but he recommend me to leave the VTEC to kick in where it is. My opinion is spend your money else...