I put the fulsac 2/1/2 header on mty 2009 CVO Ultra 110 late last summer. Best item I have added to the bike yet. I had already added Khrome Werks 3.5" power plus Slip-ons and done my own tuning with a Screamin Eagle Super Tuner. The bike ran pretty well, but when I added the Fulsac, WOW! I liked the bike before but now I love this machine. Solid torque from well below 2000 rpm and all through the midrange. All I got is the seat of the pants dyno and near 1/2 million miles of motorcyling experience, but I have to guess I easily picked up 10-15 ft lbs of torque on this bike at 2400 to 4000 rpm. I had already cooled the bike down when I did the tuning so I really can't say the Fulsac made a big difference there, but I'll say it again. It did make that 100 a torque builder and a ton more fun to ride. Still getting 42 mpg at 75 mph too.
I liked the 2/1/2 so much I bought one for the wifes FLHXXX too. Decided to try a Fuel Moto Jackpot header for that one and I can tell you the Fulsac was a lot easier to mount. Haven't had enough weather without snow and ice to test the FLHXXX yet.