I went to the CAT cams web site and found very little information (none) other than the printed specs. They do say that they will answer questions so it would be best to actually try to find out what they have to say. If there would be a decrease in power at low rpm then you do not want taller gears. Remember that there will be an increase in power just by virtue of moving from a 2.5 to a 3.0.
