In Arizona, it's best to NOT run with the bypass due to heat buildup. The ducting wasn't allowing enough blow-by air around the turbine to adequately cool it. I had the full bypass set up and later pulled it out except for the upper shield that the turbine sits under when the fuse is right side up. I also laid ceramic blanket down the top side of the rear of the fuse over the pipe to reduce heating there as well. Of course, we get temps in the 110's regularly here, so we need to make considerations with our planes around that, but the ceramic blanket (BVM) worked wonders over the thrust tube. I highly recommend that while you're still in the build phase. It was a pain to undo all the work to get it in there afterward.

Hope that helps!