The USP Marine MAX+ Forced Air Duct is engineered specifically for Mercury V10 engines to solve a well-known power-robbing problem: the "station wagon effect." This happens when exhaust fumes get pulled back into the engine intake through the rear of the cowling at speed — causing power loss, reduced top-end performance, and increased fuel consumption. The MAX+ duct channels clean, high-pressure ram air from the top of the cowling directly into the intake, pushing exhaust gases away where they belong.

Designed with the Mercury 400R in mind — the performance leader of the V10 family — this duct maximizes airflow to match the engine's demands. The 400 mainline models benefit equally from the upgrade.

Built in the USA. Built from Fiberglass.

The USP Marine MAX+ Forced Air Duct is manufactured right here in the USA using premium fiberglass construction — the same material trusted in motorsports and offshore racing applications for its superior strength-to-weight ratio, rigidity, and long-term durability in harsh marine environments. Advanced 3D scanning technology ensures a precise, Lego-tight fit to the factory V10 cowling every time. It's surface-prepped with an adhesion primer so it's ready for your color of choice straight out of the box.

Performance Numbers

• 50%+ increase in ram air intake over the factory duct
• Significantly reduced intake air temperatures at WOT
• Retains 2–3 MPH in top-end speed — even more on boats running 100+ MPH
• Blocks exhaust fumes from re-entering the intake (station wagon effect)

Highlights

• Fiberglass construction — USA manufactured
• Race-inspired F1 profile design that follows OE cowling lines
• Precision 3D-scanned fitment — drops in like a factory part
• Surface prepped with adhesion primer — ready to paint your color
• Includes 3M 4000 marine adhesive for a secure, permanent install
• Larger gains on 100+ MPH boats
• Air being forced into the engine is Non-consensual 😄

Fitment

• Mercury V10 350
• Mercury V10 400 (mainline)
• Mercury V10 400R
• Mercury V10 425