This type of system replaces your existing s-bend pipe and exhaust canisterS-bends are manufactured from .035in. thin wall stainless steel, polished to a mirror finishUse only #304 stainless which will never rustAfter a few heat cycles the stainless steel turns a golden amber color which is the characteristic signature of high quality stainless steelThese systems not only add horsepower but also drop significant weight from your bikeThe Two Brothers Racing Black Series exhausts downplays the raw power these systems unleashDyno tuned and track tested, like all TBR exhausts, the Black Series are aimed at those who want Absolute Top Level performance but smart and understated estheticsBlack Teflon coated cast magnesium end capsBlack Teflon coated billet aluminum inlets and outletsBlack Teflon coated canister reinforcement bandsSpecial Black anodized 7075 T-6 aluminum bolts that are the button-down on top of the refined Black Series