I picked up some venom injectors and I need to know if they are high or low impedance, or saturated? I'm trying to find out if I will need a resistor box or not. The product number is hp610-254, which I believe is 550cc (it's what the guy at the store told me anyway). The Venom website wasn't very helpful. I've searched for about the last 45 minutes and couldn't find anything useful. Any help will be great, Thanks.