I have this on my M900 with MADASL headers - bought for around £50 from China in SS, nicely welded not that heavy because there is no wadding in it. has a removable baffle, no idea about the noise level but I also bought some exhaust wadding off e bay to pack it with. What it will do to carburation /performance also no idea but just experimenting with degree of packing and noise/ back pressure will be interesting