Thanks, this helps tremendously. I also talked to Roger from Crossfire and he said the same thing. He said just to double check the electrical and make sure it can withstand the electrical pull to my alternator. He also said that there will be an impedance rise from 0.67 ohms anyway. I have 3 BMF 8 or 2 voice coil that can be bridged down to 0.67 ohms and I have a VR 1000D and VR 404 (brand new). I will try it out this weekend. I love the VR series of Crossfire.