I have encountered the same results when running three different Mezierre Pumps (20gpm, 35gpm & 55gpm) on my Air to Water intercooler set ups on my race car. I tried all three pumps on 1000, 2400, 3000 & 4000 HP Intercoolers. They all sucked!
I have another Mez 20 gpm that i was going to put on my Saleen but have been reluctant to because of my previous experiences. I'm glade i havent because i'm seeing more and more of this coming out now.
I have to say for a pump manufacturer to flow rate their pump with 0 restriction is, in my opinion ridiculous. Doesn anymore run these pumps on a system with 0 restriction? NO!
Recently the guys over at Lingenfelter did some testing and they came to the same conclusions. Basically the mez pumps are no better than stock in MOST applications.
Here is a link on yellowbullet:
http://www.yellowbullet.com/forum/sh...d.php?t=564702
-Mikie