The Black Series from Two Bothers Racing 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 the benefit of that amazing TBR performance and sound.