I read an extensive thread on another forum concerning concerning 135 vs 150 hondas. If what I read is accurate, the 135 is the exact same engine as the 150, but has been tuned down, and does not utilize the variable valve timing, resulting in the absence of the power band at 4200 rpms, Same engine, same weight, but a price difference at the dealer and less hp. I know little about outboards or the ECU that controls their performance, but the answer I read involves having the ECU firmware remapped, and involves no other changes at all to the motor. I am asking if anybody has any experience with this type of upgrade. I did find a couple of companies that do marine ECU tuneups for Hondas, but they both were located in the United Kingdom. I find this odd, seems there would be some American companies involved with this. The ECU remap is a common upgrade in the Honda autos, so I see this as a viable option for more hp. Can this work for 90 vs 115hp hondas as well? I am surprised there is not more discussion of this on the forum.