I was using Tighed 1's cooler which is similar except it's single pass. I took it off around a month ago to see how much my ECT's would drop. They came down 5º more or less and my IAT's went up 5º more or less. Another reason for removing it was to have space for a transmission cooler in the front. I'm still going back and forth on that one. I have a new I/C pump coming in the near future. Eliminating the possible causes.

Les