Question for any of you guys that have done this. I have the check engine light on for both cats. I had a leak in both my flex pipes that I was holding out on replacing until I did my engine mounts. When I did do my mounts and complete front suspension I then replaced the flex pipes. But the code still existed. I did the paint thinner deal with a half tank of gas for 200 miles and all seamed good. But the light came back on again and I thought I would replace both post o2 sensors. The light is still on. The car drives fine but I can tell under wide open throttle there is a issue. The car pulls decent then feels like it pulls back in and out throughout the rpm range. No misfiring, but it clearly doesn't accelerate smoothly. So I am contemplating either pulling down my exhaust and hollowing out the cats and getting a tune to bypass the post o2's, or just replace the cats and play it again. Is there any ill effect with removing the cats on these cars? like the mds feature, gas mileage etc. The only modification done to my hemi is the cold air intake, everything else is stock.