Ok guys, there may already be a post on this topic and if there is, please provide the link. I have an older dominator bowl with the 5 1/4 outlet side. what would be the benefits or lack thereof from opening this thing up? I have called around, and i get the same story, that it may add 1-5 mph. However, i was talking with a friend this weekend that did this to an older berkely bowl and lost mph. I am running a dominator 12-s, DPS inducer, stainless A impeller, and droop and turning around 5600 on motor. I know i could cut the impeller down to get more RPM, but i am planning on building a bigger motor soon, and dont wanna have to buy another $1k impeller. lol I am trying to get the most out of this pump without having to buy any more hardware. Also, what could be gained from having the impeller detailed? I will post what pics i have if needed.