FMF Racing Factory 4.1 Slip-On - Titanium Midpipe - Blue Anodized, Material: Titanium 044341 Offroad 4-Stroke &gt; EXHAUST &gt; Mufflers / Slip-ons &gt; Factory 4.1 Application: YAMAHA YZ450F 2010-11 FMF Racing Factory 4.1 044341.