Don't let the looks of this muffler fool you. Although at idle, you may cause passengers to immediately reach for their seat belts, upon acceleration, a smooth authoritative tone turns apprehension into a reassuring confidence. This is a great street/strip muffler that will maintain its rich sound qualities for the life of the muffler because there is no filler to burn off. Recommended for stock to medium modified vehicles where an aggressive sound is appreciated but not advertised. Mufflers are made from 409 stainless steel to ensure longevity. PYPES Street-Pro Muffler inlet and outlet directions are reversible (bi-directional).