I don't know, but what you need to do is contact the place you bought your 9006 and find out if they also have a system for the H4. If so, ask them to check whether the wiring harness connection to the bulb is the same. If it is, then I think you could simply purcase a set of H4 HID bulbs and leave everything else as-is. But, that is all just my guess so make sure you can verify this with the dealer or manufacturer of the HID system.MrKool said:so does any one know if i can buy replacement bulbs for my system that fit the H4 system rather then the 9006? and keep my current ignitor and blaster?