And also depending on the year, the 103"s may have a raised floor intake tract, and the exhaust port is opened.
Once that head/cubic inch was brought on the scene, HD introduced the 6 speed.......not for the rider as advertised, but rather to sneak under the radar of the EPA via dropping engine rpm at test speeds creating less emmissions.
Ever ride a bone-stock 96" bagger????? I think a golf cart has more snap.:eek