Drag pipes suck the life out of the bottom end torque cone. Look and sound good though.
Baffles are the key make sure you run baffles, torque cones may or may not help I have put in a set to see zero change, but others differ.
You could go with a DFO as it will be the least cost method of adding fuel, a powercommandr is a great tool and you might get close with the map you download.
In the long haul a good dyno tune is the best method, however go watch the shop that does the tunes, do they have a 150 or 250 dynojet, do they have the weather station, is it turned on and properly setup, do they always use a Air Fuel meter rod in the exhaust, or do they roll the bike on, air up the rear tire fiddle with the igintion and hand it back.
make sure the bikes warmed up before it goes on the dyno and make sure you have the rear tire aired up properly. Ask around about a good tuner or find out if
www.drdyno.com or Rolling thunder dyno John golden is coming to an event near you and get them to do a tuneup they do it for a living and come each year to the events so they have to work at it and do it right, not that some won't be problems.