For anyone looking at quiet 3" exhaust options for this swap, you might consider the Xforce ES-T86-02-CBS. Silly name but the kit is just slightly louder than the stock catback with Kpower header and reducer. Cost is just under $600. Fitment wasn't perfect on the passenger side tip, but I'll tweak it square at some point. It's not obnoxious at all, and doesn't sound like a noisy Honda. It also has a flex pipe included so no need to modify that. Full 3" until the two pipes exiting the muffler which are both 2".
