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USP Marine Tuning High-Flow Boost Pipe Kit for Verado 135-300

USP Marine Tuning


  • $189.99 USD
    Unit price per 
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NOTICE: This is a Race-only product. The use or installation of this product outside of the intended closed circuit racing purpose may be illegal under the Federal Clean Air Act (42 U.S.C. § 7522(A)(3)).



The factory boost pipe is constructed of plastic and is extremely narrow resulting in an airflow restriction. Being that the 135-300HP engines do not have water-cooled superchargers, the fitment is different compared to our 350-400 Boost Pipe Kit. The USP Marine pipe is constructed out of mandrel bent 2.5" aluminum tubing with 4 ply stepped silicone couplers. We also included the damage-prone factory replacement coupler, connecting the boost valve to the intake manifold. We have seen countless factory couplers damaged and causing pesky boost leaks that are very hard to diagnose. By utilizing the boost pipe kit and included coupler, the kit will allow for maximum airflow and that extra insurance policy knowing you will never have a leak. The piping is powder coated with a wrinkle black durable finish for an OEM+ look.

This replaces factory part #'s (887938003, 884408A08). 

Fits The Following Engines:

  • Mercury Verado 4-Cylinder 135 (Metal Pipe Only #893307A01)
  • Mercury Verado 4-Cylinder 150 (Metal Pipe Only #893307A01)
  • Mercury Verado 4-Cylinder 175 (Metal Pipe Only #893307A01)
  • Mercury Verado 4-Cylinder 200 (Metal Pipe Only #893307A01)
  • Mercury Verado L6 200
  • Mercury Verado L6 225
  • Mercury Verado L6 250
  • Mercury Verado L6 275
  • Mercury Verado L6 300



  • Increased Airflow (+10% CFM)
  • Durable mandrel-bent tubing
  • Reduced Restriction
  • Replaces factory damage-prone rubber design
  • 316 Stainless clamps
  • 4 Ply Silicone Tubing

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