[rocketmanx]

I was using high restistance rads before and with my upgrade to a MCP600 pump my intent was to increase flow through the cpu as my rads were slowing things down even though they were a pair in parallel. Seems to ahve worked. I believe the single BIX2 would have been not as much of an improvement for me since I'm running so many blocks. I believe, even though my NB and GP are relatively low resistance, that with as many blocks as I have and total line length and the fact that I still have some 3/8" line that a single rad would have been not much help since flowrate would not have really increased much. I'm kinda answering my own questions now but I was hoping for some real world numbers on the 2 not knowing if the BIX2 was as you said, nothing more than 2 BIX's. That doesn't always mean that it will necessarily be exaactly double the resistance. It may be more and that's what I didn't want. I think the fact that it is double length would mean fairly high resistance. I think the shorter passes of the BIX, when doubled in parallel with a strong pump would be more effective. It seems to be but I haven't tried series so not 100% certain of that. Obviously each system is a unique animal and knowing how to piece together and configure each one is the most important thing to know.