I think you might mean VTEC controller. I know that Hondata offers a reflash for the 2006-2007 civic si, it's about 600 dollars. the reflash causes vtec to engage earlier, somewhere around 4000 or 5000 rpm. Here is what Hondata has to say about vtec controllers. I looked around, but I can't seem to find a vtec controller (other than the reflash by Hondata) for the 06-07 si. I also know that some people on the temple of vtec forum like the hondata reflash, but I haven't personally seen one in action.