Each Klasse exhaust system is constructed from the highest quality materials, including SUS 304 stainless steel mufflers and mandrel bent aluminized piping. Like all HKS engineered exhaust systems, the Klasse line is 50 state street legal, and designed utilizing factory hanger locations. Each Klasse exhaust comes with stainless tip(s) which are joined to the muffler body by HKS superior MIG welding process.