I will be upgrading this winter, so I am making notes from the 2010 FLHX riders. I posted the message below on another thread.
I have the D&D Boss Glide on my 2010 FLHX.
FTR - This comparison is to my 2008 FLSTN with Vance & Hines 2-1 Pro Pipe, S/E Stage 1. (Sound was much better on the 2008 V&H)
However, considering I am comparing a complete exhaust ($$$) to a slip-on ($$), the performance is where I have the difference. Other than adding the D&D slip-ons, I did not change anything on my FLHX except the Air Cleaner, S/E Stage 1
Dyno on the 08 FLSTN (Softail Deluxe)
MX Power 71.57 Torque 83.96
Dyno on the 10 FLHX (Street Glide)
MX Power 72.56 Torque 87.37