Im looking at geting some Santee skirt blowers for my 2012 fxdb and can grab some 2006-2011 pipes for cheap. Im not sure if they will fit easy or not.

The pipes come in 06-111 and 12 up configs for dynas but the street bob was still a 96 cube motor when the others went to 103. Is that difference in the specs?

Is it just placement of o2 sensors? Is it mounting brackets? Ive sent some questions to importers and shops over the last week but no reply. Just hoping someone her might have some experience.

The O2 sensors are a different size and in a different location on the header pipes , changed for the 2012 model year on Dynas ( 2011 on Softails )

07 ( in Australia ) and 06 ( in the US ) up to and including 2011 the same headers/O2 sensors

12 and up to present date are the same

I think you will find it hard to fit them up to your bike due to the O2 sensors

howdy slothman, I removed the o2 sensors and bought some 18mm chrome countersunk hex head screw in bungs for my big radius pipes

Across the board

Lothman.
If the pipes are a good buy, use them.
If you doing hot up work, you won't need O2 probes anyway.