A Nizpro Marine Performance Repower is about optimising the performance of your engine.

Use the DIY Repower Kit to easily flash your ECU! Upgrading to a Nizpro Marine Performance Repower, your Yamaha V8 350hp OFFSHORE will make 425hp with a 6,600rpm rev limiter and have extra torque where you need it.

Increased Power, Improved Economy & Reliability? It’s all true!

Testing: We have rigorously tested the Nizpro Marine V8 425HO Performance Tune on a standard Yamaha V8 350hp OFFSHORE engine utilizing the Nizpro Marine Endurance Test on our inhouse dyno cell. The engine passed with no adverse effects*.

That same engine was also extensively water tested for 250+ hours to further validate the dyno results. These tests underpin the performance of hundreds of engines currently in market using the Nizpro Marine 425HO Performance Repower & are undertaken to ensure complete confidence in the Nizpro Marine 425HO Performance Repower.

*Performance Caveat: Engine must run on Minimum 89–90 USA grade / 95-98 AUS grade Octane fuel & have adhered to recommended Yamaha service intervals. 

Additional Tunes available from $1250USD

Please note that all NIZPRO ECU Flashing Software is ONLY compatible with Windows Computers.

STOCK YAMAHA V8 F350 OFFSHORE VS NIZPRO 425HO Performance Repower
• Power increase to 425 hp
• 20% Torque increase up to 405Ftlbs
• Nizpro Performance 6600rpm Rev Limiter
• Improved fuel economy – save up to an average 9.8% over stock F350

DIY Kit includes

• ECU Flash Interface & USB Cable
• OFFSHORE Flash Harness
• 12V Power Cable
• AC Power supply
• 6 x Nizpro 425HO Decals
• 3 x Nizpro 425HO Performance Repowers
• Exclusive Nizpro Cap
• Nizpro USB preloaded with Instructions

Suitable for Yamaha V8 OFFSHORE F300         2007  to 2009

Suitable for Yamaha V8 OFFSHORE F350         2010  to 2019

NIZPRO-Yamaha 5.3L V8 ECU Flashing Instructions