What year Outback? I would guess that this would have the quiet /medium/loud option and be a cat-back bolt on system? So your wife's Outback has the system on it, or they just used it as a pattern? What diameter tip? How does it sit in the bumper opening? The Brullen systems sound nice (on "paper") and I think they are a decent (but not screaming) deal. I don't really need stainless here in AZ, but having it show up at my door and just bolting it on would be nice (vs. running around finding a place, potentially losing use of the car for a day or so, etc.).
Edit: GTBGUY confirmed that there is a Brullen system that fits the '96-'99 Outbacks. I don't have all of the details yet, but I think it is the same price as the other Brullens systems ($510 for 2.25" or 2.5") and has the quiet/medium/loud options.