Bellowed Up-Pipe Kit 99.5-03 Ford 7.3L Powerstroke XD178 XDPThe XDP Bellowed Up Pipe Kit XD178 for your 1999. 5 2003 Ford 7. 3L Powerstroke is the fix for a common issue that robs power from your engine. Due to expansion and contraction, and extreme heat cycles, the factory installed donut gaskets designed to seal your factory up pipes will begin to leak over time. When this happens, engine performance can be reduced drastically. The XDP Bellowed Up Pipes eliminate the troublesome donut gaskets and replace