Arrow 71915PRI Pro-Race Nichrom Slip-On Mufflers w/Steel End Cap for BMW F 900 R/F 900 XR 20-24Arrow Part Number 71915PRI Note for correct fitment, this silencer must be connected to the ARROW Central Link Pipe Part# 71729MI when fitted initially. This combination can either be used with the ARROW Racing Collectors Part# 71730MI Or alternatively, the O. E. exhaust headers collector can be retained. The PRO RACE Silencer has a conical shaped profile in Nichrom [stainless steel alloy] with a silver finish. The silencer is supported with a fixed