The true dual vs 2-1 or 2-1-2 horspower/torque difference is way overblown. I have currently a SERG with 2-1-2 catless, Fullsac baffle that was Jet Hot coated and a TTS using Fullsacs map for the SERG.
Last bike was a 05 SEEG that had V&H true duals with Harley Screamin Eagle Pro's with Harley map cartridge (the one you installed with the Scan Tool) and a PCIII professionally mapped.
I can tell no difference in heat in traffic on either, wife at first thought the SERG ran hotter but has changed her mind. Got back from Key West last nite and the last trip was on SEEG with LOTS of start/stop and bike overheated several times. This trip same deal, I turned off the cylinder cancel deal because I got tired of the deal everytime I stopped so I assume it was overheating as well.
But big thing of this post, the SERG has not been on a dyno, Fullsac says to expect 95-97 Hp and about 110 or so torque with the 2-1-2 with 1.75 baffles and the TTS. The SEEG had 86 HP and 97 torque with the true duals as mentioned above, Butt feel makes new bike a little quicker, not much just a little.
So If you like 2-2 then go that way, hp/torque diff is so minumal that looks become a big thing. It yours buy and use what you like.