Yamaha F300 5.3L V8 Nizpro 425HO ECU Tune

Unlock stronger real-world performance from your Yamaha F300 5.3L V8 with the Nizpro 425HO calibration, designed to significantly increase horsepower, improve throttle response, and deliver stronger performance across the entire RPM range.

This calibration is ideal for larger offshore boats where additional power, torque, and acceleration are critical. The biggest gains are felt during acceleration, heavy load conditions, and sustained high-speed operation.

Performance Data
Stock Output: 300 HP
Tuned Output: 425 HP
Power Increase: +125 HP (+41.7%)

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

What this tune improves

The Nizpro 425HO calibration is built to unlock maximum performance from the V8 platform.

Real-world improvements include:

Significantly improved hole shot and acceleration
Stronger mid-range torque under load
Sharper throttle response
Improved performance with heavy boats or offshore conditions
Higher sustained top-end performance

This results in a more powerful and capable engine across all operating conditions.

Compatible Engines

This product is for Yamaha F300 5.3L V8 applications using the ECU numbers listed below.

F300 5.3L V8 — 2007 to 2009

ECU Compatibility

• 6BJ-00, 6BJ-01

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.