Zard Penta – Slip on Exhausts with removable dB Killer. Muffler Outersleeve Material – Black Ceramic Coated Aluminium. Muffler Inner Material – Stainless Steel. End Cap – Carbon. Very consistent increase, compared to the standard exhaust system, in terms of torque and power at any range. The desire for new goals and new challenges is the engine of life, and like in any engine, the exhaust is one of the most important component of it. It isn’t a ferrous and static element, but it is an instrument that gives voice and soul to the bike. « Kustom World, May 2015 « .