Got rid of the stock ones ,and installed the Magnaflow direct-fit catalytic converters.It took me the whole day to install them due to lack of space under the vehicle.Every piece fitted exactly the way it should. My advice though, take it to your local muffler shop, and they'll have it ready in about an hour. Overall I'm satisfied with the performance of this product. Gave it a little more aggresive deeper sound. I love it!