No raspy popping at all like the X pipe gives. I had my same LMII's and LMI's with an offroad X and both had that horrible rasp popping at around 2-2500 rpm. I got two tickets in one day with the LM1's and the offroad X. Then I decided to get the prochamber, and it made the LM1's ok for the street, but the LM2's just sound glorious with it. Heres what my LM1's sounded like with the o/r prochamber
http://videos.streetfire.net/search/...7579CC7EF4.htm