I think you may be better off w/o the chip if you already have a vtec controller. But I think the mugen chip and spoon controller will not work together, that well. You MIGHT get the the fuel/air mappings from the chip and still have the vtec controlled by the spoon. If I remember the mugen chip makes vtec come in at like 4400 or 4600.

Also do you have the JDM D15 Vtec? Just curious.