Louder exhaust does not mean more horsepower, Blown-out packing causes exhaust turbulence and increased back pressure, which reduces horsepower, Repack your silencer with this pro-quality, three-layer packing system and restore the power you've blown out, Also great for getting in compliance with new sound laws, Kit contains 1/4" thick 60" x 20" glass mat, 7" x 20" stainless wool, 8" x 20" stainless mesh, twelve 3/16" rivets, and full instructions, Made in the U.S.A.