Look under your car, just in front of the rear wheel-- you will see an exhaust tube taking a 90 degree bend and running across to the other side (to the side pipe exit). The sidepipe assembly rear of the muffler is designed to utilize the crossover, but a muffler shop could cut off the tips, remove the crossover pipes, and weld in a custom rear section from the muffler to the exit tip. Most people accomplish this with an aftermarket muffler (such as a Corsa) or a Gen IV take-off muffler.
Careful with removing all the cats-- you might regret it. Car will get quite a bit louder, the exhaust fumes will be much more noticeable, and you will have to "trick" the ECU into not throwing CELs due to the oxygen sensor fail codes. It is possible to "gut" the secondary cats (inside the side sills) and not have any issues; as long as the primary cats are in fine shape the car will even pass a smog test in most cases. Another consideration when removing all the cats is the flex pipe on the input side of the primary cat... because the muffler is fixed to the car body and the engine is rocking on rubber mounts, you need some "give" in the exhaust system following the headers to keep the movement of the engine from destroying your mid-pipe between the headers and the muffler section. Stock primary cats have this flex pipe section built-in.
Mopar headers for the Gen IV /ACR-X fit only Gen IV heads, won't work on a Gen 3.
