I have ordered the Vance & Hines Power Duals (16759) for my 2009 SERG. I will be using them with Rush slip ons with either 1.75" or 2" baffles. I plan to start with the 1.75" to see how it sounds. If I increases the size it will probably be to the 2.0" on the right side only. That is what Rush recommends anyway since exhaust flows aren't evenly distributed with the 2009 type exhausts. I have waited to install this because I wanted to finish the break in on the motor, and I'm still waiting for the Thundermax auto tune ECU for the throttle by wire touring models to become available. Zippers has told me that they will begin shipping in June. I really can't see using a non-closed loop system, like the PCV, and a dyno tune. Dyno tuning is punishing to the motor, and only achieves results that wotk at that atmospheric pressure, that altitude, that intake temperature, and that exact setup etc.. After you've done it twice you've already spent more than the thundermax anyway. Its a no-brainer to use the closed loop system like the Thundermax. I'm a bit reluctant to try the Terry Components closed loop add-on system because it uses only the rear cylinder narrow band oxygen sensor. Its range of correction will be somewhat limited from the baseline HD map, and autotunes the front cylinder based on rear cylinder readings. The Thundermax claims a range of autotune up to 50% (although the recommended settings are limited to 20% overall with 5% per run cycle), and individually tunes each cylinder with wide range oxygen sensors. I'll let you know how it goes, and it will be based on real riding experience; Not dyno numbers. Isn't that what really matters? How it feels to ride the thing?