The factory up-pipes in your 6.4L Ford Powerstroke can crack and leak overtime causing issues with overall engine performance. The No Limit Fabrication's 304 Stainless Steel Up-Pipes with HD Bellows will last the life of your 6.4 Powerstroke. These Up-Pipes are factory replacement units and are Federally Compliant. Replace them once and never worry about being left on the side of the road by defective OEM parts.