600sci Stage II = Reprogramed PCM + Innercooler water re-route + smaller pulley.
I just picked up between 9 and 10 mph with this upgrade!
My boat was consistantly doing between 80 and 82 mph, and now it is doing between 90 and 92 mph.
The picture below was my first pass after the Stage II upgrade.
I went faster (91.6 mph) with another prop, but was so excited, I forgot to take a picture of it.
Thankyou Dustin !