FMF Racing Factory 4.1 RCT Slip-On - Aluminum Muffler - Stainless Midpipe - Stainless Endcap , Material: Aluminum 044383 Size: YAMAHA 4-STROKE YZ450F 2010-2013 Style: EXHAUST/SLIP-ON MUFFLER Color: silver Warranty: All merchandise manufactured by FMF Racing has a warranty against manufacturing defects for a period of one (1) year from the date of invoice. See their site for full details.