SKU: 30071427979

USP Marine Tuning Ultimate Performance Kit for Mercury Verado 350-400 Engines

Sale price$17422.20 Regular price$19358.00
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Description

USP Marine Tuning Ultimate Performance Kit for Mercury Verado 350-400 EnginesQuestions what the kit does? Watch this explainer video first. How to install cowling. How to install boost pipe kit. Important: The MAX+ Performance Top Cowling ships in primer and must be painted to your color of choice before installation. Do not use heat or bake to dry this will warp the cowling. This is the most complete performance upgrade available for the Mercury Verado 350400HP L6 engine. The Ultimate Kit bundles USP Marine Tuning's four most

Questions what the kit does? Watch this explainer video first. 

How to install cowling.

How to install boost pipe kit.

 

⚠️ Important: The MAX+ Performance Top Cowling ships in primer and must be painted to your color of choice before installation. Do not use heat or bake to dry — this will warp the cowling.

This is the most complete performance upgrade available for the Mercury Verado 350–400HP L6 engine. The Ultimate Kit bundles USP Marine Tuning's four most impactful bolt-on upgrades into one package, tackling boost leaks, airflow restriction, fuel delivery, and engine aesthetics all at once. Buy the kit and save up to 15% compared to purchasing each component separately.

If you're serious about consistent wide-open-throttle performance, cleaner power delivery, and an engine bay that looks as aggressive as it runs — this is the kit.


What's in the Kit

(1) USP Marine Tuning MAX+ Performance Top Cowling (Replaces OEM Part #: 885354T01)

Laser-scanned for exact fitment, the MAX+ Top Cowling is manufactured in the USA using motorsports-inspired injection molding — the same lightweight, impact-resistant material used in competitive racing applications. It's built to handle daily boating and offshore conditions while giving your Verado a distinctly aggressive look. Ships in primer and must be painted prior to installation.

(1) USP Marine Tuning High-Flow Air Intake Pipe (Replaces OEM Part #: 885354T01, 8M6003032, 815504256, 888988016)

The factory plastic resonator pipe is restrictive by design and prone to cracking over time — a known failure point on these engines. The USP Marine intake pipe replaces it entirely with 4-ply wire-reinforced silicone piping (the same spec used in USP Motorsports' 1000HP turbo builds), CNC machined adapters for smooth airflow transitions, and 316 stainless clamps throughout. The result is a +30% CFM improvement over stock, sharper throttle response, and lower intake air temperatures at WOT — plus the refined supercharged induction sound these engines are known for.

(1) USP Marine Tuning Boost Pipe Kit (Replaces OEM Part #: 8M0095505, 8M0095506, 8M0095507, 888988021)

The factory boost pipe is narrow plastic — a known restriction and boost leak culprit that's notoriously difficult to diagnose. The USP Marine Boost Pipe is built from mandrel-bent 2.5" aluminum tubing with 4-ply stepped silicone couplers, finished in a wrinkle black powder coat for an OEM+ appearance. The kit also includes a replacement for the damage-prone coupler connecting the boost valve to the intake manifold — so you'll never chase a mystery boost leak again.

(1) USP Marine Tuning Billet Aluminum High-Flow Fuel Filter Kit (Replaces OEM Part #: 879885K, 879885Q)

The plastic OEM inline fuel filter was never built for serious offshore use. The USP Marine version is machined from billet aluminum, engineered with the same fuel system principles used in high-performance automotive applications, and built to withstand the harsh marine environment long-term. It protects your injectors while providing optimum flow for performance use.


Compatible Engines:

  • Mercury 350 Verado L6 (4-Stroke 6 Cyl.)
  • Mercury 350 Pro Verado L6
  • Mercury 400 Verado L6 (4-Stroke 6 Cyl.)
  • Mercury 400R L6
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SKU: 30071427979

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Kirk D. Borne
Draper, US
★★★★★ 5
Conquer AI Agent complexity with this comprehensive guidebook
Format: Kindle
This book delivers incredibly comprehensive coverage of AI Agents and their various components -- designing, creating, building, deploying with LLMs, RAG, Knowledge Graphs, and ML models (Deep Learning, Reinforcement Learning). And more! Disclosure: the publisher provided me with a free review copy of the book.
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Reviewed in the United States on October 24, 2025
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Amazon Customer
Los Angeles, US
★★★★★ 5
good book for beginners in Python and in simulation
Format: Kindle
Author made very short and simple intro into Python to jump into many different code examples to show how to solve them and to visualize results in Python. Reader will learn how to use Python libraries for modeling and simulation. Each example has an analytical solution and numerical with Python and visualization tools
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Reviewed in the United States on January 2, 2026
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Amazon Customer
Fort Morgan, US
★★★★★ 5
would highly recommend
Format: Paperback
well written even a newbie can follow
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Reviewed in the United States on May 18, 2025
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mauricio z
Massapequa, US
★★★★★ 5
great book
Format: Paperback
perfect for beginners
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Reviewed in the United States on March 22, 2024
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Samuel
Houston, US
★★★★★ 2
Don't buy, check HIS github or google collab for EVERYTHING that's in this book. NO SOLUTION
Format: Paperback
I never write reviews, but after this book I need to. DON'T BUY IT. DO NOT BUY THIS BOOK. Feels like a money grab. You are literally paying money for NOTHING buying this book. Long story short: GO TO HIS GITHUB AND GET IT ALL FOR FREE BECAUSE HE DOES NOT PROVIDE SOLUTIONS. GO ON GITHUB OR GOOGLE COLLAB AND CALL IT A DAY. In the intro he makes it seem like you don't need to know much programming or any tbh. He says if you have never programmed you should be able to read this book. HELL NO, I mean yeah you could probably figure it out, but I would not let someone that doesn't know any programming to start with this. I'd probably tell you to learn the basics of python for a week before starting at the very least. He also makes it seem like you don't need much knowledge of physics. Meh, maybe. Anyway the main reason not to buy: IT'S ALL AVAILABLE FOR FREE ON GITHUB THAT HE PUBLISHES FOR FREEEEEE. You can also use google collab, which he has up for FREEE. and if you are are a beginner I'd recommend you go off teh google collab, that way you don't have to deal with downloading anaconda and setting up an enviroment in jupyter which I think can be intimidating for a beginner. And this book doesn't really give much help in setting up everything in jupyter notebook. Also another point. He'll lead you through an example each lesson, but for the exercises he has you working on he doesn't provide a solution ANYWHERE. like why tf would you buy this book? How do you expect to learn with no feedback? You need to search online for ways to solve these problems, which I think is not a bad skill to have, but if you are new to a subject or trying to learn and you pay for a book why can't i at the very least get some solutions. even math textbook give you solutions, because the understanding is that you can make your own attempt and CHECK TO SEE IF YOU ARE RIGHT. DUHH !
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Reviewed in the United States on February 8, 2026

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