I disagree with the advice given. I have found that it is our exhausts that hamper airflow way more than an AC. Open those up, and the fuel trims will not be able to keep up. I 100% agree with using Fullsac products, too.
OK, back onto the exhausts. May as well install a new AC and filter to gain the maximum amount of power increase available. WIth open exhausts, you WILL need some form of tuning or tuning device. Lots of folks read that our ECM can adjust 10% and assume that will cover it. It does NOT. That 10% is the total amount of 'swing' that the ECM will allow the fuel trims to adjust. That is BOTH ways, fellas. So... with half of that... now it is only 5% swing. Not Enough. And... it may not be 10%, but whatever it is, new pipes or cans will swing the trims right to the wall. Doing that will eliminate the ability of the trims to 'fine tune'.
My idea is you, the OP, will need some sort of tuning device, as we all do. My recommendations to you are this: get a 'flash tune'. A flash tune alters the tables inside of the computer on the bike. Any kind of fueler or add on device tricks the computer into thinking things that are not true. Old tech for old bikes.
There are numerous ways to gain a flash tune. Go to a dyno shop and buy whatever tuner they recommend and get a tune. You should study this, and find a decent tuner, because there are a lot of hacks trying to say they tune, when, in reality, they don't. SOme tuning shops offer something a bit different. If you are NOT a DIY type of guy... then maybe you could find a shop that would tune with a 'key. There, one does NOT buy the tuner, but the shop, instead, will use there tuner, buy a license to use the tuner, and tune your bike with that. Two complete different systems cone to mind with this. Direct Link uses keys, and those keys are like $3-400 each. Also, Power Vision tuners can offer 'key' tunes fo a tad less.
I, myself recommend buying a TTS tuner for $450 and have a competent TTS tuning shop, tune your bike... but that is just me.
If you are the type to wish for his bike to run well, and properly, changing exhausts will require a different tune to compensate. If good enough is more your bag? Run em.
Fullsac will sell exhausts to suit you plus sell you a TTS with a decently close tune, for your bike, included. With THAT tune? All of the settings, etc are done and all you would need to do is go do some tuning runs to dial things in better. This IS something a newbie can accomplish, too.