went and ran it at the lake today, water pressure was 30wot on one engine, about 26on the other, i was cool outside didnt really notice any speed gain as the gps was at home. my 14 year old son said the speedo showed faster than usual . it sounded better, the rpms went up to 5400 from 5200 so i will switch carbs, and add crossovers,and see if any speed is gaind.