This is not my problem but i am asking for my friend. He just put a B16 in his 93 civic. He also put in a exhaust system, intake, and Apexi VTEC controller. Well first thing is, after he put in the Vtec controller the rev limiter will kick in at 6,300rpm. I don't have any clue why it is doing this. Also it will not kick into Vtec. He said even before when the rev limiter was working fine, vtec still was not kicking in?? So what can cause these two things. Thanks.