Super mod 15hp omc help

[Glenno]

Hi all,

I was wondering if any one out there has modified the older smaller capacity 15hp omc.
I would apreciate any input as I have started a few mods on a junk motor I have.
I will start with twin 9.9 carbs and go from there, still have the standard reed plate and standard head, no porting.
I have adapted the current model 15hp exhaust tuner though as it looked heaps better the the old one.

I know it may seem like a waist of time to some but the motor was free. I race 550 super sport in Australia and want to learn more about the way things are modded and why my current 550 motor is built the way it is (built by someone else).

Any input would be really apreciated.
Glenno