We offer both aluminized steel and stainless steel exhaust kits.  Aluminized steel is an aluminum-silicon alloy coating added to mild steel which assures a tight metallurgical bond between the steel sheet and its aluminum coating, producing a material with a unique combination of properties that are not possessed by steel or aluminum alone.Our stainless pipes are T409 which is the industry standard. T409 is a metal designed primarily for the automotive exhaust industry, brands such as Flowmaster, Invidia, Borla, etc use T409 as the standard exhaust material. T409 has a chromium content of 10-12% and a nickel content of roughly 0.50%.  T409 will not resist corrosion as well as T304 in areas where roads are often salted.  Our exhaust tips and mufflers are produced from T304 stainless steel.  T304 is the highest quality stainless steel used in the automotive world, is better at resisting corrosion, and can be easily mirror-polished.  Our mufflers and exhaust tips are always polished T304 stainless steel unless otherwise stated.