I have a cat delete pipe that is homemade as well as Borla mufflers. I am upgrading my car to a full Belanger system so this stuff needs to go. This will work on both gen 3 and gen 4 cars. If you have a gen 4 just simply unbolt your existing and bolt these on in thier place. If you have a gen 3 you will take off the rediculous cross over pipes and these will bolt directly to your existing manifold using the stock V-Clamp. Your car will run cooler, a bit louder and shave off some serious weight and unlock some HP inexpensivly. The CAT deletes with the stock mufflers sounded great on the car however once the Borlas were added the car was perfect IMO. No drone what so ever and not overly loud. I have a video clip of my 08 running with the CAT deletes and Borlas. The pipes do have spots for O2 sensors. My gen 4 would throw a CEL once in a while until I added the Mopar ECU. GEN 3 guys may need a SCT tuner I'm not sure. I'll cut a better price to anyone interested in buying the entire setup. I have used the setup for 5,000 miles with no issues. Give me a call, text or email with any questions. CAT deletes - $225 Borla's. - $725 Make me an offer on these I need them gone! Thanks, -Tim [email protected] 231. Two one five. Thirty two. Forty two.