Amazon.com: X AUTOHAUX 2pcs OD 4 Inch 90 Degree Mandrel Bend Elbow SS304 Stainless Steel Bend Tube Exhaust Elbow Pipe for Car Modified Exhaust System 4" Piping Silver Tone : Automotive
Charlotte Pipe 4 in. PVC DWV 45-Degree Hub x Hub Elbow PVC003211400HD - The Home Depot
Charlotte Pipe 4-in PVC DWV Long Sweep 1/4 Bend in the PVC DWV Pipe & Fittings department at Lowes.com