Dynomax 42327 Exhaust J-Bend Pipe Mandrel bends improve flow capacity over traditional bends Combine state-of-the-art engineering with quality material to provide exceptional strength and durability Dynomax premium pre-bent pipe is manufactured with precision benders, and then fixture checked, insuring every part is a perfect fit Pipe diameters are increased from OEM sizes to improve flow and increase power. Quick and easy installation