I removed mine about a year ago. I knew that removing the cats would create a smell. I didn't expect to smell it in the cab. It does go away after a few miles driving but not completely. My mechanic has said it's because the O2 sensors are not hooked up and I'm probably just running rich at start up. I don't have any leaks. Is there a solution to this problem? I'm frustrated as hell and seriously thinking of just reinstalling the old OEM system. Minor problem there is the muffler guy didn't switch the downpipes I gave him. He just removed the guts from the existing pipes. Is there a way to repack them? My guess is no. Any help you can give will be greatly appreciated