BORLA mufflers contain high quality, austenitic stainless steel perforated pipe wrapped with several layers of stainless steel sound absorbing material and a blanket of ceramic sound absorbing, high temperature material. The stainless steel inner construction, which is impervious to all corrosive acids, protects the ceramic packing from breaking down and getting blown out, so a BORLA muffler never needs replacing. In addition, a BORLA muffler is the most effective sound-absorbing device for the size, and it is guaranteed for one million miles.
Great info on the Borla mufflers here
http://www.hotrod.com/techarticles/borla_exhaust_hi_pro_systems/index.html
And no I don't work for them but I do like them :toothy10: