i had a "fake dual" exhaust setup on my '88 2.3 ranger, a exhaust shop put a muffler with a dual outlet and a pipe going to each rear corner. it was quiet, what i liked about it was in winter with it being cold, i had "smoke" coming off both rear corners. being that it was a 4cyl, there wasnt alot of it with it being spilt between 2 pipes. im not sure what the tailpipe dia was, and being after the converter, there is no backpressure issue. ive known of a few people that have tossed the muffler altogether and had a splittler to run fake duals with. it souds cool with a V8, awful with a 4 cyl.