DG Performance 052-4300 - RCM II Exhaust with Head Pipe & Spark Arrestor - Black fits Yamaha Rhino 660 (2004 - 2007) RCM II - with Headpipe and silencer. The best value in the ATV Industry! This complete system offers increased throttle response, more power and torque Features a durable 4 inch dia. round steel muffler body with aluminum rear cap Repackable muffler - Standard sound level is aprox. 98 db. DG offers 4 different Quiet Core Inserts to reduce exhaust sound. Equipped with a US Forestry approved spark arrestor. The best value in the ATV Industry Constructed from 16 ga. Mild steel tubing.