I have heard of people relieving the exhaust just above the cavitation plate on an outboard motor. My question is, is there any significant gain in doing this other than making the motor louder for bragging rights? Where and how are they exactly releiving the exhaust? Are they drilling holes into the midsection above the cavitation plate?
BTW:
I know I'm full of questions guys but I'm new to all this High Performance Boat stuff and I'm trying to learn all that I can.

Thanks again:
Jason