Yamaha F350 5.3L V8 Nizpro 425HO ECU Tune

Unlock stronger real-world performance from your Yamaha F350 5.3L V8 with the Nizpro 425HO calibration, designed to increase horsepower, improve throttle response, and deliver stronger performance across the RPM range.

This calibration is ideal for large offshore boats and high-load applications where additional torque and performance are critical.

Performance Data
Stock Output: 350 HP
Tuned Output: 425 HP
Power Increase: +75 HP (+21.4%)

Fuel Savings: Up to 10–12% improved efficiency
Minimum Fuel Required: 89 Octane

What this tune improves

The Nizpro 425HO calibration enhances overall engine performance and drivability.

Real-world improvements include:

Improved acceleration
Stronger mid-range power under load
Better throttle response
Improved performance in heavy offshore conditions
Enhanced top-end performance

This results in a more capable and responsive engine in demanding environments.

Compatible Engines

This product is for Yamaha F350 5.3L V8 applications using the ECU numbers listed below.

F350 5.3L V8 — 2010 to 2019

ECU Compatibility

• 6AW-016, 6AW-20, 6AW-41, 6AW-42, 6AW-50, 6AW-51

How to order

• Select your Service Type
• Select your ECU Part Number (Abridged)
• Complete checkout
• Mail in your ECU or schedule local mobile service if eligible

Service Options

Mail-In ECU Service
Nationwide service available.

Local Mobile Flash Service (Florida)
Available for qualifying local appointments within 40 miles of Ormond Beach, FL.

Important before ordering

If you do not see your ECU listed, select Not Listed / Unsure. We will verify compatibility before flashing.

Notes
Performance results can vary based on hull, prop, load, fuel quality, and operating conditions.