High compression beefier pistons, custom machined better breathing heads / valves, bigger air sucker intake, 259E cams, {you have the 255's now} beefed up clutch to handle the torque, a few other tweaks.
When we got to the top of that hill that Kevin is talking about, I was in 5th gear, but was maxed out. I think he was maxed out also. Shift into 6th at the top, then if there is no traffic in the way on the downhill side,,, you really go Zoom!
Around $8,000 to $9,000 depending on what you end up doing... Some say you should just drop in a 120R instead, which works for me. If and when I blow this one up, that is what I will prob do. So far, 10K on it, runs great, has reeeaaalllyy long legs, great hill climbing abilities. My dealer does not have a Trike dyno, so the tuner guy used the same map from an identical build on a dyno'd Ultra, then tweaked it.
I can usually go up that same hill in 6th gear depending on the number of slow pokes messing me up in the left lane.. Not sure what Kevin has done to his, but he stayed right behind me all the way up that long 7% grade. I am pretty sure I weigh more than those two together.
Sorry about hijackin' the thread Kevin.