I have the 44 series on my cougar with no cats, I love it. My friend put the same on his 08 Scion xB and it sounds pretty good actually. I can't stand the tinny weed whacker sound that comes out of most 4 cylinders with exhausts. Even the borla on the SVT I don't like.
03 Ford SVT Focus - Toms tune, Steeda mounts & stress bar, ORP, 66MM BBK TB, CFM UDP, Rota Grids
The Bad Cat (97 Merc Cougar XR7) - Flowmasters, MSD ignition, K&N intake, 19" Stern ST-4 Warps