I used an 09 pipe by plugging the old 0/2 (09) sensors and welding in new small bungs in exactly the same place as the 2011 0/2 sensors. Re-installed the 2011 0/2 sensors. Works great.
This is what I had in mind, but then decided to go ahead and add a PCV. That way I could take advantage of the additional cooling of the richened mixture, and I can remap for any future upgrades. Bikes cooler, sounds better and runs great. Not bad for $400!
if your going to use a thunder max it comes with the wide band bosch sensors yes the 09 exhaust will work on your bike. if they cats in them u will need to remove the cats. hope this helps.
Rick
that's kind of what I was thinking - except instead of stock pipes I was thinking of getting true dual head pipes for a 2009 and putting them on a 2012 bike with TMax and wideband sensors.