Decorative silencer caps are made of high-quality 304AISI stainless steel, which makes them durable and gives them 100% anti-corrosion property. Such caps not only make the exhaust look aesthetically attractive, but they also perform a function of a mini manifold. Perforation of the inner part of the cap with basalt fiber filling material allows you to catch the last hissing high frequencies of the exhaust gases, which in turn gives the exhaust a deeper sound at high engine speeds.