Elvis,
No I did not change throttle body, I am still using the stock throttle body. I am going to try my 57mm Wild Thing (Kuryakyn) Throttle Body in Aug.
I went with the HD Six Speed. I went with the complete unit, not gear set. I really wanted to try the Baker DD6, however would have had to wait for a while, so used the HD which was a quicker delivery. Put on over 2,400 miles since install, I really like it a 80mph rpm is 3,000 and 90 it is about 3,400 if I remember correctly.
The VPC 83T is a Variable Pressure Clutch. Earlier post referred to it as similar to "Slipper Clutch". Their is a write up on it in the May issue of Hot Rod Bike. Basically it is a lock up clutch, it reduces the clutch pull by at least 50% of (at normal operating RPM) stock. Not only lighter, but stronger clutch engagement than stock when it revs up. Better clutch engagement and a better feel than stock. Easier to find neutral.
Some have combined the VPC with their Hydraulic Clutch on the Screaming Eagles. Most use is with non hydraulic units. Different configurations for 88", 95" 103" 124' and up.
geezerglide