They work ok, and will take a little work to make them " better". I have customers running all sorts of combos, and yes, several Victor and many -1 set ups. We have a couple pretty good working sets of Victors, and even Pro Comp( std port) copies, but they really dont hold a candle to a good working -1 head in my opinion, at a much easier " accomplishment" rate. I would seriously question the 400CFM flow number, based on my experiences.I would prefer the 2.25 valve.