I have an unmodified Marauder Gen 2, Bobcat and Colibri in .22 and would rate the Bobcat as the quietest and the Marauder as the loudest. This is with the Marauder slightly detuned to push JSB Express 14.35 g at 860 fps, the Bobcat pushing JSB Heavy 18.13 g at 930 fps and the Colibri pushing...