I'm completely catless and no resonators 3 inch piping from turbo down to the splitter, on a torqued performance stage 2 tune. My exhaust does have a Y pipe that splits it into two 2.5in tail pipes, each of those have about a 110-120 degree angles in the pipes.
Whatever the reason, I'm happy with the sound of them, haven't had any trouble with cops yet, that include driving around a big military post with a load of super strict MP's. Maybe i've gotten lucky, because i've been pulled over for speeding a couple times here and nothing was said about the exhaust.
My buddy had (car got wrecked because of a drunk driver causing a light pole to fall right in front of him on a interstate) a 05 sti with a catless blitz nur spec exhaust, that thing was much louder than my straight pipes, and he got several tickets for it, it was built though with a giant turbo (not sure what size, but it was huge), bored cylinders, 1000cc injectors, pistons, rods, valves, coilovers, speed density tuned, the works, really miss that car, it was a monster.