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CP Performance Boaters Shopping and Product Info Guide
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Crossover Cooling Systems

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Hardin Marine
Billet And Stainless Crossover System For Mercury 454/502 Magnum MPI
mpi crossover system

mpi crossover system

Hardin Marine has just released this all new new cooling system sensation, the "Serpentine Crossover Inlet". This unit at last allows for the removal of the factory power robbing circulating pump while retaining the provision for the original pulley. This has been a challenge for years. This unit offers an optional cooling system bypass port as well as a single inlet. Removal of the circulating pump allows the engine to regain up to 15 horsepower lost by the drag of the factory pump. These kits are available with or without the pulley and for both 454/502 Mag applications as well all popular HP Mercury engines including the 500, 525, 600, and 700's.

  • Constructed of 316L stainless steel and billet aluminum.
  • O-ring sealed, no gaskets required.
  • Includes mounting bolts.
  • Multiple plumbing options from three 1" NPT ports.
  • Includes one 1" NPT x 1-1/4" Hose fitting and two 1" NPT pipe plugs.

Part No. Description
625-4453 454/502 Magnum MPI Crossover System