Allow full rack travel in the P7100 Injection Pump on your 1994-1998 Dodge 5.9L Cummins with the XDP Cummins P7100 Rack Cap XD336. The XDP Rack Cap features a precision machined 6061 billet aluminum construction and has a 12mm depth making it 4mm deeper than the stock cap. The increased depth allows for full rack travel resulting in more fuel flow and around an additional 20HP increase.