ITEM NAME:Stainless-Steel Piping Exhaust Reducer 3" to 4" Universal for Car Auto Truck .like-pro-float .like-pro-price-both{clear: both;.1 Piece Exhaust Piping Reducer. Universal fit for car and trucks modification. Made of stainless steel, rustproof and anti-corrosion. 3" O.D. to 4" O.D.