its easy. well mine was i got the pacesetter tfx. What i did was Put the back of the jeep on jackstands and fully droop the axle. Then just unbolt the old system and remove it. Here is a warning when trying to take it off the old cat make sure your relaxed, its a bitch. Also when i was finished i ended up cutting the rear track bar out b/c it was vibrating on the exhaust. Otherwise its pretty simple. Good Luck