00 GTS deleting muffler and or cats worth the time

[BlackACR]

I have a 00 ACR with the Mopar computer and, rear muffler delete the car did 415rwp 459rwt. Would cutting the door mufflers help or hurt on power, or should I cut the cats as well? The Mopar computer should help on the check engine light. Would like some feedback from people who have been there done that.