Yamaha F425 XTO 5.6L V8 Nizpro 437 Commercial ECU Tune

Unlock improved fuel efficiency and smoother operation from your Yamaha XTO 425 with the Nizpro 437 Commercial calibration, designed to reduce fuel consumption while maintaining strong and reliable performance.

This calibration is ideal for offshore boaters focused on maximizing range and reducing operating costs without sacrificing drivability.

Performance Data
Stock Output: 425 HP
Tuned Output: 437 HP

Fuel Savings: Up to 12–18% less fuel consumption
Minimum Fuel Required: 89 Octane

What this tune improves

The Nizpro 437 Commercial calibration focuses on efficiency and smooth operation.

Real-world improvements include:

Reduced fuel consumption during cruising
Smoother throttle transitions
Improved efficiency under load
Better long-distance range
Reduced operating costs

This results in a more efficient and refined offshore engine.

Compatible Engines

XTO 425 — 2019 to current

ECU Compatibility
Compatible ECU part numbers may include:

• 6GR-00
• 6GR-01
• 6GR-03
• 6GR-10
• 6GR-11
• Not Listed / Unsure

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.