I ended up going with the 11226. Just got it welded in today at lunch hour.
Immediate impression is that it is exactly what I had in mind. There is zero difference in exhaust note when the car is at warm idle-- the car is basically silent. While accelerating, the exhaust is now more audible, with a pleasant, slightly louder, deeper tone.
When cruising, there is a more noticeable exhaust note when throttle is applied. When throttle is let off, the exhaust note goes away.
I will report back after my first long road trip, which will be San Diego --> Portland --> San Diego (2000 miles roundtrip) in April about my thoughts on the 11226 for extended highway driving.