Sorry, My bad. I always thought the 95-96 model year sunfire came with the V6 from the factory. I was wrong...
It actually came with a 2.3-liter DOHC 16-valve Quad 4 engine (made 150 HP, the base motor made something like 115-120 HP). The cylinders were in a V-configuration on this engine, allowing it to run a dual exhaust no problem (cylinders were two by two, from what I can recall) The quad four was also a mainstay of earlier small oldsmobiles and sunbirds. I've seen a lot of them in junkyards, usually single-cam models with TBI (throttle body injection) the Sunfire GT's quad-4 ran MPFI (multi-port fuel injection) and two cams. The most unique feature of this perticular engine was it's v-configuration of the cylinders and twin exhaust manifolds. Back when I owned an older cavalier, I used to search lots of these cars
in wrecking yards for swappable parts (center consoles, armrests, shift knobs, etc.)
After this engine was replaced by the newer Ecotec, it made the switch over to single exhaust.
My bad. I was led to believe that the '95 or the '96 years of the sunfire had an optional V6 on the GT models. As of yet, I have found no confirmation of this fact. All that I can say for sure is for the first couple years, the GT's had a different engine than the high-performance ecotec engine that definitely replaced it, and is almost identical to the ecotec engines that are used to this day.
BTW, Subarus can handle dual exhaust as well. They run boxer fours, cylinders run two-by-two, on either side of the engine, and pistons move left-to-right, not up and down like conventional four cylinder engines.
I know a few guys have successfuly swapped earlier, iron block v6's from older cavaliers/sunbirds into the newer chassis. Perhaps that's where my confusion originated from.