3 liter Mad EFI intake, Fuel ECM, and Fuel Rail

[Mr. Demeanor]

This is a Mad EFI intake for a 3 liter Mercury outboard Engine (225-300 3 liter block non-optimax)The intake comes with the hardware shown including a fuel ECM programmed for Wayne Taylor the designer of this intake. This fuel ECM is for the early style 3 liters that have two ECM's mounted on the back of the engine between the cylinder heads. Not for the Motorola style single ECM but the rest of the system could be used on that style motor as well.
The intake has been polished and coated with Shark Hide metal protectant.


Does not include fuel injectors or any other parts/hardware not shown in the pictures.

Its on Ebay now:
https://www.ebay.com/itm/292735075066

[Tinbanger1979]

What does it take other than what's included to install? What kind of performance gain?

[Mr. Demeanor]

What does it take other than what's included to install? What kind of performance gain?

If you already have a 3 liter everything is there. You would use your injectors, sensors, etc.
As far as performance I really dont know. This is really a drag setup. They dont seem to run great cruising around. I found some info posted from Simon Motorsports saying they made 335hp with one on a 300 Promax which pretty much matches the 300X numbers. I had it on a 21' center console which was the wrong application for sure.

[Tinbanger1979]

If you already have a 3 liter everything is there. You would use your injectors, sensors, etc.
As far as performance I really dont know. This is really a drag setup. They dont seem to run great cruising around. I found some info posted from Simon Motorsports saying they made 335hp with one on a 300 Promax which pretty much matches the 300X numbers. I had it on a 21' center console which was the wrong application for sure.

Well that answers my question. I have a 250 EFI with 300 Promax heads and ecu's on my 21 foot Mako Center Console. This wouldn't be the right setup for me. GLWS. Thanks