Thunderbolt cat's are designed to give high performance in limited spaces. This high flow converter features a Metallic brick with 300 holes per square inch. This 100% EPA legal OBDII catalytic converter is designed for engine's up to 5.9L / 6000 lbs. (Not for use in California) Part # - 415250 Length - 11" Body - 4" Round Inlet - 2.5" Outlet - 2.5" Brick Type - Metallic Material - 409 Stainless Steel