I've been reading alot of posts regarding the SERT and PCIII. Do I need either of these with a stock 07 FHLT? Is my new ride so out of tune (read EPA) from the factory that I need these? Or should I wait until I do some mods(exhaust, air) to use these?

 

You do not need to add either of those to your stock FLHT. You could get better performance by choosing to do so. But, if you are planning on adding or upgrading the A/C and exhaust, I would wait until you do so.

 

My stock Ultra runs much better with the PCIII. Do yourself a favor and get it. Then when you do start doing the mods, that is one less thing to do.