Finally pulled the trigger and went with the Big Radius on the 2010 FLHX and I must say I am quite impressed. They were a little more labor intensive than expected but overall not bad. They look absolutely great on the bike and have a sound to match. I was a liitle concerned that they would be too loud overall but after a 45 minute ride that is a non issue. They have a great sound under acceleration but really quiet down at cruising speed. I could easily hear the radio with no problem.
I think it moved the passenger peg about 1" up and forward you can also move the other side. The 02 sensors do not mount in the exact same locations. I run a PC5 and need to order the block off plugs for the sensors anyway. I was suprised at how they really get quiet at cruising speeds but sound good when you want them too.