Remote start does remove cat 1 certification. I have a Clifford matrix 1 with R/S even though it doesn't work (the remote start) it would be cat 1 if it weren't for that apparently. but the quote I got for a cat 1 was identical to not having an alarm? Go figure... Also have a sterling cat 1 and Gemini on my other 2 cars, Clifford has the most features but all do the same job. Anti jacking. Pressure sensors door sensors and immobilisers with the right features enabled.