I helped my friend hollow out his cats in his 90 RX-7. It was fun but theres nothing worse than an RX-7 without cats. Kyle I wouldnt do it. You wouldnt be happy with the performance that you get out of it when you compare it to the time that you will put into doing the job. You will bearly feel it and it will sound and smell like shit. Plus you have sensors. Your car will adjust itself and it will run lean. Just leave it. If your really interested than save up and get a High Flow Catalitic Converter.