I have heard both on 2vs. I can comment on that at least. The LM1 is LOUD. The LM2 is probably more comparable to the stingers. A friend of mine has the stingers and they sound great they just are not as loud and crazy as the LM1s. Both sound very good imo. You won't go wrong with either. If you want the loudest possiblle catback get the LM1.