Yamaha F350 4.3L Nizpro 376 FSR ECU Tune

Unlock stronger real-world performance from your Yamaha F350 4.3L V6 with the Nizpro 376 FSR calibration, designed to significantly increase horsepower, improve throttle response, and deliver stronger performance across the entire RPM range.

This calibration is ideal for offshore and heavy-load applications where additional torque, acceleration, and sustained performance are critical. The biggest gains are felt when getting on plane, carrying load, and maintaining speed in demanding conditions.

Performance Data
Stock Output: 350 HP
Tuned Output: 376 HP
Power Increase: +26HP

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

What this tune improves

The Nizpro 376 FSR calibration is built to deliver a stronger and more usable powerband than stock.

Real-world improvements include:

Faster hole shot and reduced time to plane
Stronger mid-range torque under load
Sharper throttle response
Improved offshore performance in rough conditions
Higher sustained cruising and top-end performance

This results in a more powerful, responsive, and capable offshore engine.

Compatible Engines

This product is for Yamaha F350 4.3L applications using the ECU numbers listed below.

F350 4.3L — 2020 to current

ECU Compatibility

6ML-00

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.