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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Ships within 48 hours · Estimated delivery Jul 22 - Jul 27

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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
Shipping Notes
  • Free Standard Shipping on $100+ Orders to the USA.
  • Except Preorder products are shipped in 48 hours.
  • Delivery to the USA:
  1. Standard Shipping : 3-10 business days
  • If time is of the essence, please consider selecting expedited delivery for faster service.
Exchange/Return Notes
  • We offer a 30-day return/exchange service after receiving.
  • Final sale items are not eligible for returns or exchanges.
  • To process your return/exchange, please contact us at [email protected]
  • Please click here for more details>>> Return & Exchange Policy
SKU: 30071427979

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Joel Monterrey
Dallas, US
★★★★★ 5
Foams well, smells good, rinses off nicely, perfect!
Scent: Eucalyptus, Size: 12 Fl Oz (Pack of 1)
Oh five stars easily! I bought some other brand, starts with an M, but no foam! Nothing! Then I ordered this one hoping it would at the very least be foamy. It is, and it smells wonderful, and it cleans hands perfectly. It also rinses off well. FIVE STAR! I will be buying all of these! The lavender is probably my favorite scent, The Satsuma & Eucalyptus is excellent too, and I will be ordered others when they are available.
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Reviewed in the United States on June 2, 2026
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Gaffe0880
Birmingham, US
★★★★★ 5
Cleans without any harsh fragrance or residue
Scent: Fragrance Free, Size: 12 Fl Oz (Pack of 1)
I got tired of other overly-scented hand soaps and decided to give this a try. It works well for a quick wash after using the toilet and when you're hands are really dirty. It rinses off easily and quickly. While it's unscented, it does have a smell - it's hard to describe, sort of like a bleach-clean scent but, it definitely does NOT smell like bleach. It just smells "clean." Since it's in the bathroom, it also gets used to clean up some other adult things. Since it isn't scented and doesn't leave any residue it's perfect for things that are in close contact with sensitive areas.
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Reviewed in the United States on May 12, 2026
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Verified Purchase
R. Blair
Port Orchard, US
★★★★★ 5
Smells nice, foams up. Really good.
Scent: Lavender, Size: 64 Fl Oz (Pack of 1)
Good price, got it for a backup in case we run out of the stuff we normally use. It smells pretty good actually.
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Reviewed in the United States on May 24, 2026
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Diego & Natalie
Omaha, US
★★★★★ 4
Good smelling soap!
Scent: Lavender, Size: 12 Fl Oz (Pack of 1)
Smells great and is gentle on the hands. No artificial colors and no leaks! It smells good and is a good price! The pump works very well, overall am very happy with this soap!
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Reviewed in the United States on February 2, 2026
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AmyFranklySpeaking
Alexandria, US
★★★★★ 5
Must Use FOAMING SOAP BOTTLE for this soap & you will Love it!
Scent: Fragrance Free, Size: 64 Fl Oz (Pack of 1)
I have been using this soap refill for years and love it. I also use the scented versions when this is out of stock and they are not very strong scent. But if you prefer no fragrance, then this is a great soap. Many reviewers are complaining it is watery and thin. YES, IT IS. It is SUPPOSED to be. If you don't know how foaming soap works, you do need a couple pumps of foaming soap but you are using a fraction of the amount of soap you would use (aka WASTE) with standard soap. Have you ever seen your kid pump soap in the bathroom? Not once, or twice, but three or four times? Well, they can do that with this soap and not waste it because it's half air in each pump. It's SUPPOSED to be for foaming hand soap. Don't get fooled by your costly regular or foaming soap. Buy this and have clean hands and SAVE money! My family has very sensitive skin and nobody gets rough, red hands from this soap. No problems. HIGHLY RECOMMEND THESE FOAMING SOAP DISPENSERS FOR THIS PRODUCT: https://www.amazon.com/dp/B07PVFXSVC/ref=sbl_dpx_bath-accessories-countertop-soap-dispensers_B07Z8J57J7_0?th=1 UPDATE ON REVIEW (August 2020): I recently just ordered this item and it was delivered with new packaging. I thought it was the same product, but it seems to have additional ingredients now including alcohol. Hm. Need to look closer into this and will update when figure out what has changed. UPDATE ON INGREDIENTS (October 2020): The new formula is now showing the ingredients. It has changed. A lot. One ingredient that was removed is PHENOXYETHANOL which is GREAT they removed that! However, if they only removed that, then this would be an amazingly safe hand soap (by EWG standards it would be golden). However, it is a completely different soap with a completely different list of ingredients. I will wait until the EWG rates these ingredients before continuing to purchase this. As other reviewers have noted, it does now have "fragrance" in the ingredients - and misleadingly states "(natural)" next to the word fragrance, which means absolutely nothing in terms of what is allowed and what is not. Do your research on what the word "fragrance" means on labels and what could possibly be in your product under that ingredient. In addition it now does have alcohol in it, which some may like, however I don't think soap needs it. If you are washing, you don't need to sanitize anything. It's overkill ingredient - not needed and dries your hands out.
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Reviewed in the United States on August 18, 2020

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