Starting Line Products Lightweight Silencer 09-311 Lightweight, durable silencers SLPs 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 than previously experienced with our ERA 2000 products