Walker (670) 41991 Walker Heavy Duty Reducer. O.D: 4", I.D: 3 1/2", Length: 6". Reduces larger I.D pipes and or tubing to smaller O.D Pipe.

Walker®, with our worldwide OE partnerships and manufacturing facilities, possesses the technical excellence needed to meet today's emissions control needs, while developing solutions for tomorrow's challenges. Walker® is a 'one-stop' convenience, offering complete engine-to-tailpipe coverage of replacement emissions control systems and components for popular domestic and import vehicles in broadmarket, performance, and commercial vehicle applications. Walker® delivers optimal OE-style fit, appearance, and dependability in aftermarket emissions control parts.