PRO RMK MATRYX SLASH SNOWMOBILE EXHAUST MUFFLER SILENCER - 27-05019SLPs new ERA 2014 Silencing Technology features silencing designs combined with some exotic materials and manufacturing techniques, which together offer low sound level at a much lighter weight SLPs ERA 2007 Silencing Technology features advanced silencing technology while still providing great weight savings and a rich, full sound Models equipped with this latest technology still sound like a snowmobile should, but the level of sound output is lower