So your saying I can get away with out the air filter or power commander.Will my bike have any problems if I just install the exhaust pipes?
Folks say maybe, but let's look at the facts. Your Harley comes from the factory too lean for it's own good. There are people getting first degree burns on the inside of their thighs if they get caught-up in traffic and can't get air flowing to the engine! This heat can be reduced by literally 100 degrees at a stand-still by adding some sort of fuel management that improves the fuel mix. Adding freer flowing exhaust pipes will only make the engine run hotter.
Even without new pipes or a new A/C, I'd highly recommend at least H-D's SERF (Screamin' Eagle Race Fueler) or even Nightrider's XIEDs, which do work as confirmed by my dealer. If you end up with a new exhaust and A/C, get the SERT (Screamin' Eagle Race Tuner) which is like a PowerCommander III, but your dealer won't refuse to honor your factory warranty and you'll be able to retain the O2 sensors, which will be very beneficial if you find yourself on a road trip and in turn start changing altitudes a lot.
The carbed engines had some play where you could put pipes on and not necessarily have to do anything else to the engine. With an EFI, everything is so... digital... that it's just not an option. You need to richen the fuel mixture or risk internal damage to your engine. Plus, you'll get a smoother power band, cooler engine, and a more "accurate" H-D sound (which thrives on a richer fuel mix).