here's what I used,
but the thing is, the stock piping is 1.5" or something like that. it's small, so to use that resonator, you'd be going from 1.5" to 2.25" back to 1.* after the resonator. The stock Y pipe is the holdup. So, if you were to use this setup, i'd have a muffler shop install this resonator using 2.25" pipe from the cat flange to the resonator then whatever you want there; probably stepping back down into the exhaust pipe.
another alternative is to use some smaller dual bullet mufflers more matched to the car's pipe diameter. I'd still come all the way back from the cat flange to eliminate the stock y-pipe.
It's a 1.75" in/out single, it's outside dia. is 3.5" so it'll fit good with two in there, similar to stock mounting.