Always wanted a 2.25" exhaust with a Supertrapp muffler, on my hatch.
Well, I finally got it installed today.

I got the S/C 449-2218.
It's flat black, 4" round and 18" long and I have 9 disks installed.
It's barely even noticeable at the back of my car. Very low key.

AWESOME!
At idle and low RPM's, it has a nice deep, low tone.
At higher RPM's, say doing 80 on the express way, it's so quiet.
I can barely hear it over the sound of my intake.
It's got a deeper tone and just slightly louder.

And, my "butt dyno", tells me that it feels more open and like it's breathing better.