Hello all I've decided to go with the Vance & Hines Large Radius 2 into 2 pipes for my 2012 Road King Classic 103ci, also a K&N filter. From what I understand these pipes can accommodate the factory O2 sensors. Will I have to Re-Map my fuel injection with these pipes & K&N filter? Lastly where can I find a reasonable priced set of Chrome shocks for my 2012 Road King, I want to remove the stock air shocks. Looking on the internet most of the chrome shocks I saw were around four to five hundred dollars. Thanks all.....det45