I am looking at 500Efi boats, what are some of the upgrades I can use to increase HP without going blower, is there a cure for the sooty transom's with these motors? any help would be appreciated. I understand I cant expect huge HP gains without really getting into the motors but some new fuel management and bolt on's would be nice.

I have a new top plenum that will be available soon for the 500 and 525 efi engines and I can also program the ecu's.

Tell me more about upgrades for the 525efi?

I developed a new top for the engines and it has the injector blades built right in the top of the plenum so the air can go straight down the runners and into the intake ports. I should have them ready soon.

So the runners don't cross over to the other bank? how long are the runners? BOB

Yes you keep the bottom part of the manifold. We made a new top that replaces your old top and throttlebody. We have the injector blades built right in the top of the plenum top so the incoming air can go straight down the runners for more power and throttle response.

OH,now I got ya.I'd like to see that.Always interested in "trick" stuff. Any dyno runs yet? BOB

any progress on getting into the computer?

Hey Tyler:

Good idea! What RPM range is it good for? I'm driving down to Sterling next week maybe I can drop in on Wed?

Tom

Yes I picked up up over 30 HP and the same on Torque. It even raised the whole power and torque curves a couple hundred RPM's.