I've been using my Apexi V-AFC for about a year now, and I've been having some trouble with it. I have settings for stock cross-over (5800 RPM) and have settings for an earlier cross-over (4800). My problem is that sometimes V-Tec works, and sometimes it doesn't. I heard rumors of how the VAFC messes up your V-Tec system. Is this true? Cuz mine seems to be kinda spudering, or more like an on/off switch that changes on, off, on, off. My friend had the same problem with his, and he got rid of his. Is anyone else having this problem? Is there a way to fix it. And yes it was installed properly. Any info would be great.