unfortunatly it will mess with the sesner. the reason that its infrount of the cat is to see how much pressure there is there befor the cat. If that pressure changes and dropps it dumps allot of gas in the motor to try to compensate. you get really carppy gas mileage. and if you ever have to do an emitions test and they see that the cat is gone you can get a pretty nice fine. It sucks. But one thing that you can do is buy a high flow cat. That are about 250 bucks. pretty spendy. So i would just do the hole exast system over. Get some flow master mufflers. I accually have 2 of them if you wanna buy one.
93 wrangler 8 inch SOA SRS suspention lift 35/12.50 Mt. efi 350 700r4 tranny np 205 t case dana 44s front and rear. lots of extras.