Maximizing Smoothest High Exhaust Air Flow Rate. Slip Fit Joints to Provide Easiest Fabrication. 4 X 48 Straight Pipes. 4 X 90 Degree Pipes. 4 X 45 Degree Pipes.4 X 180 Degree U-Bends. International Buyers please Note: a. These charges are the buyers responsibility. We are committed to achieving 5 star ratings. We will try our best to resolve any kind of issue.