Folks need to pay close attention to their states emissions laws. In CO they put our cars on a roller, run them up to 55, and do a sniff test while they do it. Do you think I would chance catted DP's? Nope, because I know it will fail after doing the research.
LMS does warn you about emissions and off-road use only (maybe not strictly in the link to that catted DP, but it is all over their site)! Hell, my tuner came with multiple warnings, JUST FOR THE TUNE! Regardless, it isn't on your shop (LMS or any other) to inform you of your state emissions laws, EPA standards, or anything else. It is up to you to understand these laws and know what you can do to your car/truck/bike, etc.
In CO we have zero emissions on new cars for the first 7 years...so you can have a lot of fun until then. After that it is every other year. If you are willing to swap back to original parts every two years you can run what you want! In my case, I don't want to. I would rather rebuild a motor, or build a new motor, than swap exhaust parts for an emissions test. That said, because I did my research, I know I don't want the DP's.
Just sayin'!