Two Brothers M-5 Black Series Slip-On Exhaust BMW R1200GS / Adventure The Two Brothers Black Series Exhaust has become a staple among TBR customers who are seeking to unlock the vast potential in their motorcycles. What makes the Black Series so unique True to its name, the Black Series exhausts are constructed with black Teflon coated cast magnesium end caps, black billet aluminum inlets and outlets, and black canister reinforcement bands. Every little detail has been considered and you get to reap the benefits of that amazing TBR performance and sound. Adding a Two Brothers Racing high performance Black Series exhaust will help you gain additional horsepower and increase torque while lowering the overall weight of your bike. All M-Series exhaust feature the TBR spiral-wound perf core which gives each exhaust system that distinct, deep, Two Brothers exhaust note. All of Two Brother's inlets and connecting pipes are manufactured from .035 thin wall stainless steel. They then are polish to a satin finish. Two Brothers' uses only #304 stainless which will never rust. After a few heat cycles the steel turns a golden amber color which is the characteristic signature of high quality stainless steel. The entire line of TBR M Series canisters feature the same high level of quality construction and are designed to be fully serviceable in the event of damage, routine maintenance or the occasional repack. Two Brothers Racing's V.A.L.E. slip-on exhaust and flange-on exhaust features CNC'ed aluminum inlets. These special designs provide for ease of maintenance as well as simplified construction, which is what a premium performance product is all about! The exhaust note produced by all of their Top Level exhaust is best described as being deep and throaty without suffering from the shrill whine normally associated with other manufacturer's straight through muffler canisters. V.A.L.E. V ariable A xis L ocking E xhaust. The V.A.L.E. system is TBR's revolutionary and patented method of attaching their muffler canisters to the exhaust tube without the use of springs or welding. Their V.A.L.E. systems allow the muffler assembly - exhaust tube and canister - to be positioned perfectly on the bike before all the mounting hardware is fully tightened. Once the canister and exhaust tubes are properly aligned, the V.A.L.E. assembly locks the muffler canister to the exhaust tube assuring a perfect, leak-free fit. Note CARB compliant for use in California. Please check local laws before purchasing a Two Brothers Exhaust. Some modifications may be prohibited in some states.